vdsm.spec: increase policycoreutils version for RHEL

Due bz#893065 if selinux is disable vdsm package can not
be installed on RHEL systems.

Change-Id: Ib2b40781e4e6bba28ac5ebcf54ff089bad09e36d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=903309
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11341
Reviewed-by: Mark Wu <wudxw@linux.vnet.ibm.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>