Update help text for some network commands

Add help text for network delete, network set and network show

Change-Id: I80ad5eae35f0eba2bfe19e06786c9b8ed1522046
Closes-Bug: #1343659

Author: Steve Martinelli

openstackclient/network/v2/network.py

@@ -83,6 +83,7 @@ def get_body(self, parsed_args):
 
 
 class DeleteNetwork(command.Command):
+    """Delete a network"""
 
     log = logging.getLogger(__name__ + '.DeleteNetwork')
 
@@ -157,6 +158,7 @@ def take_action(self, parsed_args):
 
 
 class SetNetwork(command.Command):
+    """Set network properties"""
 
     log = logging.getLogger(__name__ + '.SetNetwork')
 
@@ -213,6 +215,7 @@ def take_action(self, parsed_args):
 
 
 class ShowNetwork(show.ShowOne):
+    """Show network details"""
 
     log = logging.getLogger(__name__ + '.ShowNetwork')