IBM SDN-VE does not need the l3 agent

Add the IBM SDN-VE plug-in to the listings.

Add this plug-in to the list of plugins that do not need
neutron-l3-agent to work. Also reorder this list alphabetically.

Change-Id: Ia475a16e1345e15a93fd11ba7ddb56a47a84eac9
Closes-Bug: #1337023
Merge "IBM SDN-VE does not need the l3 agent"