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/digital_ocean/digital_ocean_domain.py

@@ -47,6 +47,10 @@ options:
 notes:
   - Two environment variables can be used, DO_CLIENT_ID and DO_API_KEY.
   - Version 1 of DigitalOcean API is used.
+
+requirements:
+  - "python >= 2.6"
+  - dopy
 '''
 
 
@@ -74,15 +78,14 @@ EXAMPLES = '''
       ip={{ test_droplet.droplet.ip_address }}
 '''
 
-import sys
 import os
 import time
 
 try:
     from dopy.manager import DoError, DoManager
+    HAS_DOPY = True
 except ImportError as e:
-    print "failed=True msg='dopy required for this module'"
-    sys.exit(1)
+    HAS_DOPY = False
 
 class TimeoutError(DoError):
     def __init__(self, msg, id):
@@ -229,6 +232,8 @@ def main():
             ['id', 'name'],
         ),
     )
+    if not HAS_DOPY:
+        module.fail_json(msg='dopy required for this module')
 
     try:
         core(module)
@@ -239,5 +244,5 @@ def main():
 
 # import module snippets
 from ansible.module_utils.basic import *
-
-main()
+if __name__ == '__main__':
+    main()