Minimum Ansible version check

Moved version check to callback pluging to allow checking the version
prior to playbook syntax checking. This prevents errors on
syntax-checking with older versions of Ansible.

callback_plugins/0_version_requirement.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python
+
+import sys
+from ansible import __version__
+
+if __version__ < '2.0':
+    from ansible.callbacks import display as pre2_display
+    CallbackBase = object
+
+    def display(*args, **kwargs):
+        pre2_display(*args, **kwargs)
+else:
+    from ansible.plugins.callback import CallbackBase
+    from ansible.utils.display import Display
+
+    def display(*args, **kwargs):
+        display_instance = Display()
+        display_instance.display(*args, **kwargs)
+
+
+# Set to minimum required Ansible version
+required_version = '2.2.0.0'
+DESCRIPTION = "Supported versions: %s or newer" % required_version
+
+
+def version_requirement(version):
+    return version >= required_version
+
+
+class CallbackModule(CallbackBase):
+    """
+    This callback module stops playbook execution if the Ansible
+    version is less than required, defined by required_version
+    """
+
+    CALLBACK_VERSION = 1.0
+    CALLBACK_NAME = 'version_requirement'
+
+    def __init__(self):
+        super(CallbackModule, self).__init__()
+
+        if not version_requirement(__version__):
+            display(
+                'FATAL: Current Ansible version (%s) is not supported. %s'
+                % (__version__, DESCRIPTION), color='red')
+            sys.exit(1)