Remove use of term 'slave' in replication support

[Greg Lucas]

The initial commits for replication support used the term 'slave' in a number of places. For example, to create a replica the current parameter passed in the create call is "slave_of".

The review feedback for Change-Id: Ieca67f042c6bcb33f2a4de1acbb330d3eefc0600 (https://review.openstack.org/#/c/101771/) concluded that 'slave' is a MySQL-specific term and the more generic term 'replica' should be used instead.

We need to be consistent in the use of 'replica' in the visible APIs and CLI options.

Optionally we may also want to update the database schema as well so that the terminology is consistent throughout.

[Greg Lucas (glucas-q)]

This affects the pending Horizon change sets as well.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/117881

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/117925

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/117881
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=53f79f62552d60a6d1a92ffdea292c175466b4e5
Submitter: Jenkins
Branch: master

commit 53f79f62552d60a6d1a92ffdea292c175466b4e5
Author: Nikhil Manchanda <email address hidden>
Date: Fri Aug 29 13:38:40 2014 -0700

    Use 'replica' instead of 'slave'

    The term 'slave' is very mysql specific. Deprecate the API terminology
    that references 'slaves', and 'slave_of', and replace it with 'replicas',
    and 'replica_of' instead which is more applicable across datastores of
    different types.

    Co-Authored-By: Greg Lucas <email address hidden>
    Change-Id: Ief4bc83369fa3183a321d3e07b69b1801595ab15
    Closes-bug: 1360310

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/118521

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/117925
Committed: https://git.openstack.org/cgit/openstack/python-troveclient/commit/?id=b287f672ac650defda96939945192af6df452136
Submitter: Jenkins
Branch: master

commit b287f672ac650defda96939945192af6df452136
Author: Greg Lucas <email address hidden>
Date: Fri Aug 29 22:58:04 2014 -0400

    Use 'replica' instead of 'slave'

    Replace the mysql-specific term 'slave' with the more general term
    'replica'.

    In order to merge properly the client currently handles both 'slave' and
    'replica' in certain cases. The 'slave' support will be removed completely
    once the trove runtime is updated to be in sync.

    Change-Id: Id22d18a84a4ac104ff8af09959e8eb2ae0102e97
    Co-Authored-By: Nikhil Manchanda <email address hidden>
    Partial-Bug: 1360310