Fixes nova-compute failing to start on Fedora 18

Fixes bug #1086784
Adds a rule to the policy-kit allowing the stack user to manage libvirt

Change-Id: I6e9c0106c932f5f5f5c5c18ff79ac81a050c4599
add numpy to package list, saves lots of time

websockify was added to the pip requires, and it has a dependency
of numpy. Because we didn't specify it in the package list, it was
built from source every time, adding 3 minutes to an average run.

Stop testing whether numpy compiles 100 times a day in CI.

Change-Id: Ic9d9b8135a917deb846911c6b266aec87d05781a
Merge "Fixes nova-compute failing to start on Fedora 18"
Merge "add numpy to package list, saves lots of time"