spec: bump policycoreutils-python >= 2.0.83-19.47.el6_6.1

On el6.6 the version with the fix is:
policycoreutils-2.0.83-19.47.el6_6.1 [1]
On el6.7 it is
policycoreutils-2.0.83-19.48.el6 [2]

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1148800
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1148062

Change-Id: Ic494d41e4834f48476d06dfdceefda8037aef212
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1139873
Signed-off-by: Mooli Tayer <mtayer@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/36148
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>