common: allow spaces for affinity group desc

Change-Id: I80fc31a9b1880f1f0da8cec9d3431316c156ad77
Bug-Url: https://bugzilla.redhat.com/1129012
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>
(cherry picked from commit bebb7936f6a4a13579416d4113640e432df6d7c2)