Refactor openFirewall() and add support for x11vnc/vncserver

installJRMC

@@ -928,7 +928,7 @@ EOF"
 
         # Open the ports
         if [[ "$ID" =~ ^(fedora|centos)$ ]] && [[ -x $(command -v firewall-cmd) ]]; then
-            if ! _firewall-cmd --get-services | grep -q "$1"; then
+            if ! _firewall_cmd --get-services | grep -q "$1"; then
                 _firewall_cmd --permanent --new-service="$1" > /dev/null 2>&1
                 _firewall_cmd --permanent --service="$1" --set-description="$1 installed by installJRMC" > /dev/null 2>&1
                 _firewall_cmd --permanent --service="$1" --set-short="$1" > /dev/null 2>&1