Adding API to attach/detach port using Nova API

Change-Id: I91c7fe2321c7d44879cdebd4bc2d3a17c1913538
Added require js in dev-install as it is required for web-server-manager.

Change-Id: If4339aef496827d02e44c353bfd133fc2571090e
Merge "Adding API to attach/detach port using Nova API"
Merge "Added require js in dev-install as it is required for web-server-manager."