Add help for nova interface-list to decoder

Running "openstack port list --server <id>" is a good replacement for
"nova interface-list <id>", add it to the decoder.

Change-Id: I656e190f4da59d9c57e9ab97d068a8a0dbd77774

Author: jharbott

doc/source/cli/data/nova.csv

@@ -60,7 +60,7 @@ instance-action,,Show an action.
 instance-action-list,,List actions on a server.
 interface-attach,,Attach a network interface to a server.
 interface-detach,,Detach a network interface from a server.
-interface-list,,List interfaces attached to a server.
+interface-list,port list --server,List interfaces attached to a server.
 keypair-add,keypair create,Create a new key pair for use with servers.
 keypair-delete,keypair delete,Delete keypair given by its name.
 keypair-list,keypair list,Print a list of keypairs for a user
@@ -137,4 +137,4 @@ volume-update,,Update volume attachment.
 x509-create-cert,WONTFIX,Create x509 cert for a user in tenant.
 x509-get-root-cert,WONTFIX,Fetch the x509 root cert.
 bash-completion,complete,Prints all of the commands and options to
-help,help,Display help about this program or one of its subcommands.
+help,help,Display help about this program or one of its subcommands.