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/cloud/amazon/ecs_task.py

@@ -95,7 +95,6 @@ task:
     sample: "TODO: include sample"
 '''
 try:
-    import json
     import boto
     import botocore
     HAS_BOTO = True
@@ -120,7 +119,7 @@ class EcsExecManager:
                 module.fail_json(msg="Region must be specified as a parameter, in EC2_REGION or AWS_REGION environment variables or in boto configuration file")
             self.ecs = boto3_conn(module, conn_type='client', resource='ecs', region=region, endpoint=ec2_url, **aws_connect_kwargs)
         except boto.exception.NoAuthHandlerFound, e:
-            self.module.fail_json(msg=str(e))
+            module.fail_json(msg="Can't authorize connection - "+str(e))
 
     def list_tasks(self, cluster_name, service_name, status):
         response = self.ecs.list_tasks(

lib/ansible/modules/extras/cloud/amazon/ecs_taskdefinition.py

@@ -93,7 +93,6 @@ taskdefinition:
     type: dict inputs plus revision, status, taskDefinitionArn
 '''
 try:
-    import json
     import boto
     import botocore
     HAS_BOTO = True
@@ -118,7 +117,7 @@ class EcsTaskManager:
                 module.fail_json(msg="Region must be specified as a parameter, in EC2_REGION or AWS_REGION environment variables or in boto configuration file")
             self.ecs = boto3_conn(module, conn_type='client', resource='ecs', region=region, endpoint=ec2_url, **aws_connect_kwargs)
         except boto.exception.NoAuthHandlerFound, e:
-            self.module.fail_json(msg=str(e))
+            module.fail_json(msg="Can't authorize connection - "+str(e))
 
     def describe_task(self, task_name):
         try:

lib/ansible/modules/extras/cloud/amazon/route53_facts.py

@@ -160,7 +160,6 @@ EXAMPLES = '''
 
 '''
 try:
-    import json
     import boto
     import botocore
     HAS_BOTO = True

lib/ansible/modules/extras/cloud/vmware/vca_nat.py

@@ -130,7 +130,6 @@ EXAMPLES = '''
 '''
 
 import time
-import json
 import xmltodict
 
 VALID_RULE_KEYS = ['rule_type', 'original_ip', 'original_port',