Ensure that pip is installed before using it.
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

varunarya10/puppet-nova,JioCloud/puppet-nova,pllopis/puppet-nova,datacentred/puppet-nova,TelekomCloud/puppet-nova,arnaudmorinol/puppet-nova,madkiss/puppet-nova,larsks/puppet-nova,DylanYu/puppet-nova,cristifalcas/puppet-nova,JioCloud/puppet-nova,varunarya10/puppet-nova,javiplx/puppet-nova,datacentred/puppet-nova