Updated openstack/openstack
Project: openstack-dev/devstack  20522e3b0e69c1f37ebeb7b4a66d9ced9e2a4236

Add pcre devel package for Horizon

pyScss python module uses pcre if available for performance
and it is better to be installed.
This commit adds it for files/{apts,rpms}/horizon.

Change-Id: If711fa222d3f395efd670334c8a84f35d195dc25