utils: Moved pgrep and getCmdArgs from storage/misc

They are general enough and useful elsewhere.

Change-Id: Ia9a933bec0df3f7773c0f8e47fc0bf0492149031
Bug-Url: https://bugzilla.redhat.com/987813
Signed-off-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/23040
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>