Move modules and module_utils unit tests to correct place (#81)

* Move modules and module_utils unit tests to correct place.

* Update ignore.txt

* Fix imports.

* Fix typos.

* Fix more typos.

tests/unit/plugins/module_utils/xenserver/common.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright: (c) 2019, Bojan Vitnik <bvitnik@mainstream.rs>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+def fake_xenapi_ref(xenapi_class):
+    return "OpaqueRef:fake-xenapi-%s-ref" % xenapi_class
+
+
+testcase_bad_xenapi_refs = {
+    "params": [
+        None,
+        '',
+        'OpaqueRef:NULL',
+    ],
+    "ids": [
+        'none',
+        'empty',
+        'ref-null',
+    ],
+}