Add name option to 'port set'

Port's name can be updated in NeutronClient and it is a very
good feature for a user to have the ability to rename a port.
This was missing in the openstackclient, and the same has been
added in this patch.

Change-Id: I6e712ef08ab1c0a23786c4bb6972d3e0f8f0f999
Implements: blueprint neutron-client

doc/source/command-objects/port.rst

@@ -130,6 +130,7 @@ Set port properties
         [--binding-profile <binding-profile>]
         [--host-id <host-id>]
         [--enable | --disable]
+        [--name <name>]
         <port>
 
 .. option:: --fixed-ip subnet=<subnet>,ip-address=<ip-address>
@@ -168,6 +169,10 @@ Set port properties
 
     Disable port
 
+.. option:: --name
+
+    Set port name
+
 .. _port_set-port:
 .. describe:: <port>