Fix openvswitch-switch status command on Ubuntu platform

When running on Ubuntu, the manifest checks the status of the
openvswitch-switch service using the Upstart 'status' command and
grep-ing on 'start/running'.

Change-Id: Icf17fa2bb6f9f5449673c3737b9ecbb24dbeebb1
Closes-Bug: #1288659
Fixed gate by Updating Gemfile to pin Rake to 10.1.1

The latest Rake update requires Ruby >= 1.9. Bundler in the
current gate uses 1.8.x. This update fixes the gate by pinning
Rake to the last known working version.

Change-Id: Id43f3f30491c899cee9b8cecec2f755f014a08b1