Fix path for restorecon

On RHEL6 restorecon is in /sbin and on newer RHEL based systems it is in /usr/sbin

Closes-Bug: rhbz#1109079
Change-Id: I5662c4337ff23310c12a86834c51c6a3ec151a1f
(cherry picked from commit c6e0dff2b49183dd6d94d32e80d353172d3365ac)