packaging: setup: centos: fixed changes after engine split

fixed references to constants moved around when making
engine an option.

Change-Id: I44f8508fef3cd275fdd5f34c4158579ae9e73608
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
(cherry picked from commit ff4644fe1a6a98b4030fc292ae20ea74b5153ae9)