Remove cell setup and db creation nova upgrade

cell0 is already setup in Ocata, when upgrading to Pike
is not anymore necessary to create.
All nova DBs (nova_api, nova and nova_cell0) are already
created in Ocata too. Only bootstrap_service is needed
while upgrading.

Change-Id: Idc4941334faf91feee868472155a8c8ea0eba436

ansible/roles/nova/tasks/upgrade.yml

@@ -2,14 +2,6 @@
 # Create new set of configs on nodes
 - include: config.yml
 
-# TODO(inc0): since nova is creating new database in L->M, we need to call it.
-# It should be removed later
-- include: bootstrap.yml
-
-# TODO(Jeffrey4l): Since nova need setup nova cell in N->O, we need to call it.
-# This should be removed later
-- include: simple_cell_setup.yml
-
 - include: bootstrap_service.yml
 
 - include: register.yml