spec: require policycoreutils and skip sebool errors

In order to avoid a policycoreutils bug (rhbz 883355) when selinux is
disabled we now require the version 2.1.13-44 (or newer) of Fedora.
Additionally we now skip any error in the rpm scriptlets for the sebool
configuration (sebool-config) since they could interfere with the rpm
installation potentially leaving multiple packages installed.

Change-Id: Iefd5f53c9118eeea6817ce9660ea18abcfd1955c
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/9840
Reviewed-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11363