If unable to connect to the XML-RPC server print a more useful error msg.

ipa-admintools/ipa-groupmod

@@ -29,6 +29,7 @@ import ipa.ipaerror
 import xmlrpclib
 import kerberos
 import ldap
+import errno
 
 def usage():
     print "ipa-groupmod [-a|--add] [-r|--remove] user group"
@@ -140,8 +141,11 @@ def main():
 
             client.update_group(group)
             print args[1] + " successfully updated"
-    except xmlrpclib.Fault, f:
-        print f.faultString
+    except xmlrpclib.Fault, fault:
+        if fault.faultCode == errno.ECONNREFUSED:
+            print "The IPA XML-RPC service is not responding."
+        else:
+            print fault.faultString
         return 1
     except kerberos.GSSError, e:
         print "Could not initialize GSSAPI: %s/%s" % (e[0][0][0], e[0][1][0])