packaging: setup: exportfs after restarting nfs services

Bug-Url: https://bugzilla.redhat.com/1163395
Change-Id: I4d231c28d2fd2e28163fbe382debbf080628d9b9
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit f179315e6a77e27b3d9894ec8d20ebfd3aa1a461)