New module: xenserver_guest_powerstate - manages powerstate of XenServer VMs (#49425)

* Initial commit for xenserver_guest_powerstate module
* Added unit tests for the module, removed unused imports

test/units/modules/cloud/xenserver/FakeAnsibleModule.py

@@ -0,0 +1,30 @@
+# -*- 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)
+
+
+class AnsibleModuleException(Exception):
+    def __init__(self, *args, **kwargs):
+        self.args = args
+        self.kwargs = kwargs
+
+
+class ExitJsonException(AnsibleModuleException):
+    pass
+
+
+class FailJsonException(AnsibleModuleException):
+    pass
+
+
+class FakeAnsibleModule:
+    def __init__(self, params=None, check_mode=False):
+        self.params = params
+        self.check_mode = check_mode
+
+    def exit_json(self, *args, **kwargs):
+        raise ExitJsonException(*args, **kwargs)
+
+    def fail_json(self, *args, **kwargs):
+        raise FailJsonException(*args, **kwargs)