Update for modules which import json.

Some do not use the json module directly so don't need import json.
Some needed to fallback to simplejson with no traceback if neither was installed

Fixes #1298

lib/ansible/modules/extras/monitoring/stackdriver.py

@@ -92,10 +92,16 @@ EXAMPLES = '''
 # ===========================================
 # Stackdriver module specific support methods.
 #
+
 try:
-  import json
+    import json
 except ImportError:
-  import simplejson as json
+    try:
+        import simplejson as json
+    except ImportError:
+        # Let snippet from module_utils/basic.py return a proper error in this case
+        pass
+
 
 def send_deploy_event(module, key, revision_id, deployed_by='Ansible', deployed_to=None, repository=None):
     """Send a deploy event to Stackdriver"""