Comment 2 for bug 1497212

Reviewed: https://review.openstack.org/225161
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=42f6a55c0a81cdc2b35bc48b452143e9a7a8bd20
Submitter: Jenkins
Branch: master

commit 42f6a55c0a81cdc2b35bc48b452143e9a7a8bd20
Author: Csaba Henk <email address hidden>
Date: Fri Sep 18 15:56:58 2015 +0200

    glusterfs*: fix ssh credential options

    glusterfs and glusterfs_native had a distinct
    set of options to specify ssh credentials
    (glusterfs_server_password vs glusterfs_native_server_password
    and glusterfs_path_to_private_key vs glusterfs_native_path_to_private_key).

    There is no reason to keep these separate; but worsening the situations
    these options have been moved to layouts in an ad-hoc manner,
    breaking certain driver/layout combos whereby the credential
    option used by the driver is not provided by the chosen layout
    and thus it was undefined.

    Fix all the mess by defining glusterfs_server_password and
    glusterfs_path_to_private_key in glusterfs.common, and
    providing the native variants as deprecated aliases.

    Change-Id: I48f8673858d2bff95e66bb7e72911e87030fdc0e
    Closes-Bug: #1497212