Galera clustercheck script should be used with available_when_donor=1

[Bogdan Dobrelya]

AVAILABLE_WHEN_DONOR should be 1 as Fuel configures a non-blocking xtrabackup replication.
https://github.com/stackforge/fuel-library/blob/master/deployment/puppet/openstack/templates/galera_clustercheck.erb#L22

That would improve the UX with the full cluster reassemble replication time. Currently, when all galera nodes went down and cluster is being reassembled completely, the donor node will not accept any SQL connections - as HAproxy will not allow it - until the first node got synced from it and becomes ready for services. But there is nothing prevents the donor node to accept connections from the very beginning of the outgoing replication. So, the clustercheck script should report the donor as available ASAP - and that is what available_when_donor option does.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/168803

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/168803
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=36a67eceba98bb0f02a8b701445fe694de47f5ae
Submitter: Jenkins
Branch: master

commit 36a67eceba98bb0f02a8b701445fe694de47f5ae
Author: Bogdan Dobrelya <email address hidden>
Date: Mon Mar 30 09:47:24 2015 +0200

    Set galera clustercheck available_when_donor to 1

    AVAILABLE_WHEN_DONOR should be 1 as Fuel configures
    a non-blocking xtrabackup replication and HAproxy
    backend for donor should report as available.

    That would improve the UX with the full cluster
    reassemble replication time - the donor node will
    be ready for service ASAP

    Change-Id: I9044a38fb651573a7428b9a9d0bd9d209cb5dcb5
    Closes-bug: #1437816
    Signed-off-by: Bogdan Dobrelya <email address hidden>