Make python-guestfs NOPRIME & install for libvirt

The libguestfs dependency tree includes a number
of packages that we may not want or work everywhere, such as fuse.

Now python-(lib)guestfs will install from lib/nova_plugins/hypervisor-libvirt

Change-Id: I6c3a614010ee8d65813eec66a56680def622514c
Insecure check if keystone is up

If we start keystone with an SSL endpoint then the curl check to see if
it is running will fail because it cannot create a secure connection.
This check can be done insecurely as all we care about is that the
service has started.

Change-Id: I826753d4d46e9956f443110029346bc70282951a
Merge "Make python-guestfs NOPRIME & install for libvirt"
Merge "Insecure check if keystone is up"
Merge branch 'master' of github.com:openstack-dev/devstack