Lower reserved memory for nova-compute
Lower reserved memory for nova-compute

Lower reserved memory for nova compute nodes in a
memory restricted environment.

Change-Id: I75635ab99d4d55628f6b32446beb14ae7333575a
Closes-Bug: #1778597

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates