Avoid stig failures when installing xmpp

src/freedombone-app-xmpp

     chmod -R 700 /etc/prosody/conf.d
     usermod -a -G www-data prosody
 
+    # Avoid STIG failures
+    if [ -f /usr/lib/ssl/private/xmpp.key ]; then
+        chown root:root /usr/lib/ssl/private/xmpp.key
+    fi
+    if [ -f /usr/lib/ssl/certs/xmpp.crt ]; then
+        chown root:root /usr/lib/ssl/certs/xmpp.crt
+    fi
+    if [ -f /usr/lib/ssl/certs/xmpp.dhparam ]; then
+        chown root:root /usr/lib/ssl/certs/xmpp.dhparam
+    fi
+
     if [ -d /etc/letsencrypt ]; then
         usermod -a -G ssl-cert prosody
     fi