Always setup cells v2

Nova is going to land a database migration in Ocata
under change I72fb724dc13e1a5f4e97c58915b538ba761c582d
which enforces that at least the simple cells v2 setup
is performed, which creates the cell mappings, cell0 and
host mappings. Before we can land that change in Nova
we have to make cells v2 setup a default in the integrated
gate jobs.

Depends-On: Ie44e615384df464516aa30b9044b5e54b7d995bb

Change-Id: If1af9c478e8ea2420f2523a9bb8b70fafddc86b7
diff --git a/stack.sh b/stack.sh
index fab2edd..e908a9a 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1380,7 +1380,7 @@
 # ----------------------
 
 # Do this late because it requires compute hosts to have started
-if is_service_enabled n-api && [ "$NOVA_CONFIGURE_CELLSV2" == "True" ]; then
+if is_service_enabled n-api; then
     create_cell
 fi