Remove redundant arping package from apts/nova

Nova is dependent on arping because 'arping -U' is used.
Arping package doesn't provide 'arping -U'. Let iputils-arping
do the arping job.

Change-Id: Iad4cbf823881de4656fb6a4e32285cf2a49b1d2a
Add configurable use of veths with Quantum+OVS.

 * This patch adds the ability to configure use of veths with
   OVS via the Q_OVS_USE_VETH variable.  The use of veths with OVS
   is required to support namespaces on RHEL.
 * Supports bug 1171727

Change-Id: I5f557d659684ead99a3e5e2b4df787699d9d3f05
Merge "Remove redundant arping package from apts/nova"
Merge "Add configurable use of veths with Quantum+OVS."