Get host by connector does not validate for volume name mapping during terminate connection

[Chhavi Agarwal]

During terminate_connection we pass the volume_name to ensure that volume mapping for the host is removed.

Currently get_host_by_connector() ignore the volume_name validation if the host is found in the connector wwpns

This causes issues in some scenarios where WWPNS from different host entry are passed

Proposed fix: if volume_name is passed in get_host_by_connector it should also validate if the host_name selected has mapping for the given volume.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/753134

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 18.0.0.0rc1 release candidate.