pxc charm needs amulet test coverage refactor

[Ryan Beisner]

The percona-cluster charm needs amulet tests.

Currently, the pxc tests exercise only Trusty-Icehouse, and should be refactored to include all test cases in basic_deployment.py, with series-release test definitions in line with the other openstack charms.

Ex:
http://bazaar.launchpad.net/~openstack-charmers/charms/trusty/glance/next/files/head:/tests/

[James Page (james-page)]

https://review.openstack.org/#/c/442364/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/442364
Committed: https://git.openstack.org/cgit/openstack/charm-percona-cluster/commit/?id=fd6097fcb211550bbbd76605851451eba6ec5d6f
Submitter: Jenkins
Branch: master

commit fd6097fcb211550bbbd76605851451eba6ec5d6f
Author: James Page <email address hidden>
Date: Tue Mar 7 10:18:33 2017 +0000

    Redux amulet tests

    Refactor to support direct use of BasicDeployment test class
    in all gate tests. As hacluster now defaults to using unicast
    transport, the configuration for multicast device address is
    no longer required and can be dropped, removing the need to
    specialize tests on a per series basis.

    Use min-cluster-size in tests to ensure that pxc clusters
    build out correctly.

    Refactor specific test cases into BasicDeployment test
    class so they get executed against all series, including

        kill mysqld test
        pause/resume tests

    Closes-Bug: 1546577

    Change-Id: I239946808f68a0225b49c0327da2b4d35715b837