Replicas are scheduled on the same host as the primary

[Goutham Pacha Ravi]

Currently, while scheduling a new replica, the ShareReplicationFilter passes any host that shares the
replication_domain of the active replica's host. On successive runs on the CI, it was observed that the same
host was chosen multiple times. In a real deployment, there is no practicality in allowing replication
within the same pool.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/291287

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/291287
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=0616fcb8fe4ef2734db4b0107a220068170e8683
Submitter: Jenkins
Branch: master

commit 0616fcb8fe4ef2734db4b0107a220068170e8683
Author: Goutham Pacha Ravi <email address hidden>
Date: Mon Mar 7 20:06:50 2016 -0500

    Disallow scheduling multiple replicas on a given pool

    Currently, while scheduling a new replica, the ShareReplicationFilter
    passes any host that shares the replication_domain of the active
    replica's host. On successive runs on the CI, it was observed
    that the same host was chosen multiple times. In a real
    deployment, there is no practicality in allowing replication
    within the same pool.

    Pass more information to assist the filter in disqualifying hosts that
    already host replicas for the share.

    Also treat NoValidHost exception differently from other scheduler
    exceptions to be consistent with other scheduling failures.

    Change-Id: Iedc7b752c7fc477d6257d100e2277378d59f1fde
    Closes-Bug: #1554282

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/manila 2.0.0.0rc1 release candidate.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/manila 2.0.0 release.