Several cleanups to many modules:

* Fix docs to specify when python2.6+ is required (due to a library
  dep).  This helps us know when it is okay to use python2.6+ syntax in
  the file.
* remove BabyJson returns.  See #1211  This commit fixes all but the
  openstack modules.
* Use if __name__ == '__main__' to only run the main part of the module
  if the module is run as a program.  This allows for the potential to
  unittest the code later.

lib/ansible/modules/cloud/google/gce_net.py

@@ -102,7 +102,9 @@ options:
     default: null
     aliases: []
 
-requirements: [ "libcloud" ]
+requirements:
+    - "python >= 2.6"
+    - "apache-libcloud >= 0.13.3"
 author: Eric Johnson <erjohnso@google.com>
 '''
 
@@ -123,18 +125,15 @@ EXAMPLES = '''
 
 '''
 
-import sys
-
 try:
     from libcloud.compute.types import Provider
     from libcloud.compute.providers import get_driver
     from libcloud.common.google import GoogleBaseError, QuotaExceededError, \
             ResourceExistsError, ResourceNotFoundError
     _ = Provider.GCE
+    HAS_LIBCLOUD = True
 except ImportError:
-    print("failed=True " + \
-            "msg='libcloud with GCE support required for this module.'")
-    sys.exit(1)
+    HAS_LIBCLOUD = False
 
 def format_allowed_section(allowed):
     """Format each section of the allowed list"""
@@ -182,6 +181,9 @@ def main():
         )
     )
 
+    if not HAS_LIBCLOUD:
+        module.exit_json(msg='libcloud with GCE support (0.13.3+) required for this module')
+
     gce = gce_connect(module)
 
     allowed = module.params.get('allowed')
@@ -281,11 +283,11 @@ def main():
                 changed = True
 
     json_output['changed'] = changed
-    print json.dumps(json_output)
-    sys.exit(0)
+    module.exit_json(**json_output)
 
 # import module snippets
 from ansible.module_utils.basic import *
 from ansible.module_utils.gce import *
 
-main()
+if __name__ == '__main__':
+    main()