Final fixes

opennebula-common/opennebula-common.post-deinstall

@@ -2,9 +2,12 @@
 
 set -e
 
-userdel -r oneadmin && echo ">> User 'oneadmin' has been removed."
-groupdel cloud && echo ">> Group 'cloud' has been removed."
+ONE_GROUP=cloud
+ONE_USER=oneadmin
 
-rm -rf /var/lib/one /var/run/one /var/log/one /var/lock/one
+userdel -r ${ONE_USER} 2>/dev/null  && echo ">> User '${ONE_USER}' has been removed."
+groupdel ${ONE_GROUP} 2>/dev/null  && echo ">> Group '${ONE_GROUP}' has been removed."
+
+rm -rf /var/lib/one /var/run/one /var/log/one /var/lock/one 2>/dev/null
 
 exit 0