Remove unused package dependencies

* /sbin/vconfig command is not used by either nova or neutron.
* Now the AMQP carrot is not used, not even optionally by
  the oslo.messaging.
* python-gfalgs just referenced as a similar configuration style,
  by neutron.

Change-Id: Idde5446e47e7da1dd204ea518ab816e2cce77c7d
Merge "Remove unused package dependencies"