Rework neutron system host management to operate on agent states
rather than an extended host entity, as it was agreed with the
neutron team that a new host level entity was not desired in the
neutron core.
This commit modifies the neutron override values to accommodate
the above.
Story: 2003857
Task: 26669
Depends-On: I441fcf3c186f68d17abafe337af71d0caf9c40da
Change-Id: I85943d5b6f421f4ef379694f21ad2d758bb5f38a
Signed-off-by: Kevin Smith <kevin.smith@windriver.com>