Move Conditional class to netcfg. Added error handling for connect and execute methods.

Fix comments

lib/ansible/module_utils/nxos.py

@@ -128,6 +128,7 @@ class Nxapi(object):
 
         return result
 
+
 class Cli(object):
 
     def __init__(self, module):
@@ -142,11 +143,16 @@ class Cli(object):
         password = self.module.params['password']
 
         self.shell = Shell()
-        self.shell.open(host, port=port, username=username, password=password)
+
+        try:
+            self.shell.open(host, port=port, username=username, password=password)
+        except Exception, exc:
+            self.module.fail_json('Failed to connect to {0}:{1} - {2}'.format(host, port, str(exc)))
 
     def send(self, commands, encoding='text'):
         return self.shell.send(commands)
 
+
 class NetworkModule(AnsibleModule):
 
     def __init__(self, *args, **kwargs):
@@ -190,7 +196,10 @@ class NetworkModule(AnsibleModule):
         return responses
 
     def execute(self, commands, **kwargs):
-        return self.connection.send(commands, **kwargs)
+        try:
+            return self.connection.send(commands, **kwargs)
+        except Exception, exc:
+            self.fail_json(msg=exc.message, commands=commands)
 
     def disconnect(self):
         self.connection.close()
@@ -206,6 +215,7 @@ class NetworkModule(AnsibleModule):
         response = self.execute(cmd)
         return response[0]
 
+
 def get_module(**kwargs):
     """Return instance of NetworkModule
     """