ISPConfig 3.1 + Metronome XMPP on CentOS 7.2 (based on the Perfect Server tutorial)

I've followed the tutorial https://www.howtoforge.com/tutorial...l-php-pureftpd-postfix-dovecot-and-ispconfig/ and I'm stuck at getting ISPConfig 3.1 to configure Metronome XMPP on CentOS 7.2 (the XMPP instructions in the ISPConfig 3.1 Manual are mostly for Debian so I adapted a bit for CentOS).

I did the following:
1. yum install lua* prosody libidn libidn-devel libidn2 libidn2-devel
2. adduser -M -s /sbin/nologin -c 'Metronome' metronome
3. cd /opt; git clone https://github.com/maranda/metronome.git metronome; cd ./metronome; ./configure # results below

[root@ares metronome]# ./configure
Lua interpreter found: /usr/bin/lua...
Looking for Lua... Checking Lua includes... lua.h found in /usr/include/lua.h
Writing configuration...

Installation prefix: /usr/local
Metronome configuration directory: /usr/local/etc/metronome
Using Lua from: /usr

Done. You can now run 'make' to build.​

4. make; make install # results below

[root@ares metronome]# make
sed 's|^#!\/usr\/bin\/env lua$|#!\/usr\/bin\/env lua|' plugins/muc_log_http/generate_log > generate_log.install
sed "s|^#!\/usr\/bin\/env lua$|#!\/usr\/bin\/env lua|; \
s|^CFG_SOURCEDIR=.*;$|CFG_SOURCEDIR='/usr/local/lib/metronome';|; \
s|^CFG_CONFIGDIR=.*;$|CFG_CONFIGDIR='/usr/local/etc/metronome';|; \
s|^CFG_DATADIR=.*;$|CFG_DATADIR='/usr/local/var/lib/metronome';|; \
s|^CFG_PLUGINDIR=.*;$|CFG_PLUGINDIR='/usr/local/lib/metronome/modules/';|;" < metronome > metronome.install
sed "s|^#!\/usr\/bin\/env lua$|#!\/usr\/bin\/env lua|; \
s|^CFG_SOURCEDIR=.*;$|CFG_SOURCEDIR='/usr/local/lib/metronome';|; \
s|^CFG_CONFIGDIR=.*;$|CFG_CONFIGDIR='/usr/local/etc/metronome';|; \
s|^CFG_DATADIR=.*;$|CFG_DATADIR='/usr/local/var/lib/metronome';|; \
s|^CFG_PLUGINDIR=.*;$|CFG_PLUGINDIR='/usr/local/lib/metronome/modules/';|;" < metronomectl > metronomectl.install
sed 's|certs/|/usr/local/etc/metronome/certs/|' metronome.cfg.lua.dist > metronome.cfg.lua.install
test -f metronome.release && \
cp metronome.release metronome.version || true
make -C util-src install
make[1]: Entering directory `/opt/metronome/util-src'
gcc -fPIC -Wall -I/usr/include -c -o encodings.o encodings.c
MACOSX_DEPLOYMENT_TARGET="10.3"; export MACOSX_DEPLOYMENT_TARGET;
gcc -o encodings.so encodings.o -shared -lidn
gcc -fPIC -Wall -I/usr/include -c -o hashes.o hashes.c
MACOSX_DEPLOYMENT_TARGET="10.3"; export MACOSX_DEPLOYMENT_TARGET;
gcc -o hashes.so hashes.o -shared -lcrypto
gcc -fPIC -Wall -I/usr/include -c -o pposix.o pposix.c
pposix.c: In function ‘lc_fallocate’:
pposix.c:679:2: warning: #warning Only using posix_fallocate() fallback. [-Wcpp]
#warning Only using posix_fallocate() fallback.
^
pposix.c:680:2: warning: #warning Linux fallocate() is strongly recommended if available: recompile with -D_GNU_SOURCE [-Wcpp]
#warning Linux fallocate() is strongly recommended if available: recompile with -D_GNU_SOURCE
^
pposix.c:681:2: warning: #warning Note that posix_fallocate() will still be used on filesystems that dont support fallocate() [-Wcpp]
#warning Note that posix_fallocate() will still be used on filesystems that dont support fallocate()
^
MACOSX_DEPLOYMENT_TARGET="10.3"; export MACOSX_DEPLOYMENT_TARGET;
gcc -o pposix.so pposix.o -shared
gcc -fPIC -Wall -I/usr/include -c -o signal.o signal.c
MACOSX_DEPLOYMENT_TARGET="10.3"; export MACOSX_DEPLOYMENT_TARGET;
gcc -o signal.so signal.o -shared
install *.so ../util/
rm pposix.o signal.o
make[1]: Leaving directory `/opt/metronome/util-src'
make -C certs localhost.cnf
make[1]: Entering directory `/opt/metronome/certs'
sed 's,example\.com,localhost,g' openssl.cnf > localhost.cnf
make[1]: Leaving directory `/opt/metronome/certs'
make -C certs localhost.key
make[1]: Entering directory `/opt/metronome/certs'
openssl genrsa 4096 > localhost.key
Generating RSA private key, 4096 bit long modulus
.......................................++
.........................................................++
e is 65537 (0x10001)
make[1]: Leaving directory `/opt/metronome/certs'
make -C certs localhost.cert
make[1]: Entering directory `/opt/metronome/certs'
openssl req -new -x509 -nodes -key localhost.key -days 1825 \
-sha1 -out localhost.cert -utf8 -config localhost.cnf
make[1]: Leaving directory `/opt/metronome/certs'
[root@ares metronome]# make install
install -d /usr/local/bin /usr/local/etc/metronome /usr/local/lib/metronome/modules /usr/local/lib/metronome
install -m750 -d /usr/local/var/lib/metronome
install -d /usr/local/etc/metronome/certs
install -d /usr/local/lib/metronome/core /usr/local/lib/metronome/net /usr/local/lib/metronome/util
install -m755 ./metronome.install /usr/local/bin/metronome
install -m755 ./metronomectl.install /usr/local/bin/metronomectl
install -m644 core/* /usr/local/lib/metronome/core
install -m644 net/*.lua /usr/local/lib/metronome/net
install -d /usr/local/lib/metronome/net/http
install -m644 net/http/*.lua /usr/local/lib/metronome/net/http
install -m644 util/*.lua /usr/local/lib/metronome/util
install -m644 util/*.so /usr/local/lib/metronome/util
install -d /usr/local/lib/metronome/util/sasl
install -m644 util/sasl/* /usr/local/lib/metronome/util/sasl
umask 0022 && cp -r plugins/* /usr/local/lib/metronome/modules
install -m755 ./generate_log.install /usr/local/lib/metronome/modules/muc_log_http/generate_log
install -m644 certs/* /usr/local/etc/metronome/certs
test -e /usr/local/etc/metronome/metronome.cfg.lua || install -m644 metronome.cfg.lua.install /usr/local/etc/metronome/metronome.cfg.lua
test -e metronome.version && install metronome.version /usr/local/lib/metronome/metronome.version || true
make install -C util-src
make[1]: Entering directory `/opt/metronome/util-src'
install *.so ../util/
make[1]: Leaving directory `/opt/metronome/util-src'​

5. install ISPConfig 3.1 - at the XMPP part it detects Metronome XMPP but throws some errors:

Configuring Mailman
Configuring Dovecot
Configuring Spamassassin
Configuring Amavisd
Configuring Getmail
Configuring Jailkit
Configuring Pureftpd
Configuring BIND
Configuring Apache
Configuring vlogger
[INFO] service OpenVZ not detected
Configuring Bastille Firewall
Configuring Metronome XMPP Server
PHP Warning: unlink(/etc/metronome/metronome.cfg.lua): No such file or directory in /tmp/ispconfig3-stable-3.1-36e7a4c956bfce74d87b264feefc41c659581454/install/lib/installer_base.lib.php on line 1583
writing new private key to 'localhost.key'
..... ### certificate details here
make: *** No rule to make target `localhost.key'. Stop.
make: *** No rule to make target `localhost.csr'. Stop.
make: *** No rule to make target `localhost.cert'. Stop.
chmod: cannot access ‘/etc/metronome/certs/localhost.key’: No such file or directory
chown: cannot access ‘/etc/metronome/certs/localhost.key’: No such file or directory
sh: update-rc.d: command not found
Failed to restart .service: Unit name .service is not valid.
Configuring Fail2ban
.........​