Ensure that pip is installed before using it.

We need to ensure that pip is available before
trying to install xenapi with it.

Change-Id: I97ccbabe6e77205e516cc3b7e17bac8824a19520
Closes-Bug: #1183060
Add auth_version option in nova::api

Add a new option auth_version in nova-api keystone_authtoken section.

Change-Id: Ifcbd51b9d549e1d0f3d90cddb461ccb6760aa1e2
enable libvirt at boot

When using libvirt driver, we need to ensure that libvirt service is
actually enabled at boot.

Change-Id: Ie3198010ca8cfbe515d4e99e2662330f6ac29290
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge "Ensure that pip is installed before using it."
Merge "Add auth_version option in nova::api"