Improve printer installation script

- Remove all printers from known print servers before installing again
- Add second print server

roles/lmn_printer/templates/install-printers.sh.j2

@@ -18,13 +18,14 @@ EOF
 ## Remove all printers not wanted:
 for p in $installedprinters ; do
     printer_ip=$(lpstat -v "${p}" | sed -nE "s%.*ipp://(.+)/printers.*%\1%p")
-    if [[ ! "${hostgroup}" =~ "$p" ]] && [[ ! "${usergroup}" =~ "$p" ]] \
-       && [[ -n $printer_ip ]] && (echo "${printservers}" | grep -w -q "${printer_ip}"); then
+    if [[ -n $printer_ip ]] && (echo "${printservers}" | grep -w -q "${printer_ip}"); then
 	echo "Removing print queue '$p'."
 	lpadmin -x "$p"
     fi
 done
 
+installedprinters="$(lpstat -v | cut -f 3 -d" " | sed 's/:$//' )"
+
 ## Add all printers needed:
 for ps in $printservers ; do
     echo "Checking print server '$ps' for available printers:"
@@ -39,6 +40,7 @@ for ps in $printservers ; do
 		timeout 10 lpadmin -p "$p" -E -v \
 			"ipp://$ps/printers/$p" \
 			-m "driverless:ipp://$ps/printers/$p" || echo "Adding queue '$p' failed."
+		installedprinters+=" $p"
 	    fi
 	fi
     done