update to nxos_command with additional exception handling

This update adds exception handling to catch errors when trying to parse
command output to json.  It also removes the dependency on importing json
opting to use the AnsibleModule methods instead

lib/ansible/modules/network/nxos/nxos_command.py

@@ -20,7 +20,7 @@ DOCUMENTATION = """
 ---
 module: nxos_command
 version_added: "2.1"
-author: "Peter sprygada (@privateip)"
+author: "Peter Sprygada (@privateip)"
 short_description: Run arbitrary command on Cisco NXOS devices
 description:
   - Sends an aribtrary command to an NXOS node and returns the results
@@ -62,7 +62,6 @@ options:
         trying the command again.
     required: false
     default: 1
-
 """
 
 EXAMPLES = """
@@ -118,7 +117,6 @@ failed_conditions:
 import time
 import shlex
 import re
-import json
 
 INDEX_RE = re.compile(r'(\[\d+\])')
 
@@ -127,12 +125,6 @@ def to_lines(stdout):
         if isinstance(item, basestring):
             item = str(item).split('\n')
         yield item
-def get_response(data):
-    try:
-        json_data = json.loads(data)
-    except ValueError:
-        json_data = None
-    return dict(data=data, json=json_data)
 
 def main():
     spec = dict(
@@ -173,7 +165,12 @@ def main():
 
         for index, cmd in enumerate(commands):
             if cmd.endswith('json'):
-                response[index] = json.loads(response[index])
+                try:
+                    response[index] = module.from_json(response[index])
+                except ValueError, exc:
+                    module.fail_json(msg='failed to parse json response',
+                            exc_type=str(type(exc)), exc_message=str(exc),
+                            response=response[index])
 
         for item in list(queue):
             if item(response):