Moving pidStat function to utils

As in general it doesn't serve only the storage part

Change-Id: Iad76fd978283c9dc55635075ff195211cced2d64
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/10932
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>