Move chown of /etc/freeswitch/tls to postinst

Doing a chown of something in /etc/ as part of a systemd service file
is totally broken.  It's far too large a sledgehammer to point at /etc
here.  Someone may legitimately not be using /etc/freeswitch/tls in
his configuration, in which case this chown would fail and cause FS to
fail to start.  Or someone may legitimately need /etc/freeswitch/tls
to have different ownership, in which case we would clobber it here.

The right thing to do is to create this directory in the
postinst (which we already are, assuming there is not an existing
configuration) and then perform the chown of it at the same time.

FS-7697

debian/freeswitch-systemd.freeswitch.service

@@ -8,8 +8,6 @@ After=syslog.target network.target local-fs.target
 ; service
 Type=forking
 PIDFile=/run/freeswitch/freeswitch.pid
-PermissionsStartOnly=true
-ExecStartPre=/bin/chown freeswitch:freeswitch /etc/freeswitch/tls
 ExecStart=/usr/bin/freeswitch -ncwait -nonat
 TimeoutSec=45s
 Restart=always

debian/freeswitch.postinst

@@ -31,6 +31,7 @@ case "$1" in
     done
     if [ ! -d "/etc/freeswitch" ]; then
       mkdir -p /etc/freeswitch/tls/
+      chown freeswitch:freeswitch /etc/freeswitch/tls
       cp -a /usr/share/freeswitch/conf/vanilla/* /etc/freeswitch/
     fi
     ;;