Change message in certain cases

In some cases Puppet error messages are useless.
This patch implements algorithm which makes certain error
messages more userfriendly.

Change-Id: Iac6f1c5382b3c3d605df3477477558858eca69ef
Fixes: rhbz#989334, rhbz#1006476, rhbz#1003959

tests/modules/test_ospluginutils.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2013, Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import os
+from unittest import TestCase
+
+from ..test_base import PackstackTestCaseMixin
+from packstack.modules.ospluginutils import gethostlist
+
+
+class OSPluginUtilsTestCase(PackstackTestCaseMixin, TestCase):
+    def test_gethostlist(self):
+        conf = {"A_HOST": "1.1.1.1", "B_HOSTS": "2.2.2.2,1.1.1.1",
+                "C_HOSTS": "3.3.3.3/vdc"}
+        hosts = gethostlist(conf)
+        hosts.sort()
+        self.assertEquals(['1.1.1.1', '2.2.2.2', '3.3.3.3'], hosts)