packaging: setup: split of engine-setup-plugin

Update includes and constants packages due to changes
on constant packages in engine-setup for engine
setup split.
Move constants files to the right position to
adopt the same schema.

This patch depends from: http://gerrit.ovirt.org/#/c/27647/
from ovirt-engine project

Change-Id: I1e53dd09940697fe6ef73ed63ef4369e73b02c42
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>