Update barbican kmip gate to non-voting check from experimental
Update barbican kmip gate to non-voting check from experimental

Patch linked below fixes the kmip back end check, so once it is merged,
we can make it non-voting instead of experimental.

Depends-On: I64e27a26dfe02d794b725763c55d0197bc2c46bd
Change-Id: I7695c5a2c824e8f608a2281b3eedc45ed7da577a

openstack-infra/project-config,openstack-infra/project-config