Add the ML2 plugin to DriverLog
Add the ML2 plugin to DriverLog

The ML2 plugin is deprecating the OVS and LinuxBridge plugins, so
add it to DriverLog.

Change-Id: Id29cd77f93f0a7b2fc1e61f280b52a789da8f613

stackforge/driverlog,irinapovolotskaya/i