missing means to adjust share servers after share_backend rename

[Maurice Escher]

Hi,
I changed my share back end names and thus need to change the host of share instances and share servers.

Background for doing this:
Previously all had the same name, each manila-share host only had its own back end configuration.
For a replication setup I need all configurations present on all hosts.
Therefore they need to have different names.

Solution proposal:
For share instances I can already do this with

`manila-manage share update_host --currenthost old_backend_name --newhost new_backend_name`

Extend this method to update share servers, too.

Cheers,
Maurice

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/731486

[Vida Haririan (vhariria)]

Additional comments http://eavesdrop.openstack.org/meetings/manila/2020/manila.2020-05-28-15.00.log.html

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/731486
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=365cfa35164e411ae88d7404394b5f073c64d126
Submitter: Zuul
Branch: master

commit 365cfa35164e411ae88d7404394b5f073c64d126
Author: Maurice Escher <email address hidden>
Date: Tue May 26 18:22:54 2020 +0200

    add share server update to manila-manage share update_host

    Change-Id: Ifb19d926a84fae986b8d296959cfce71bf0c2e9e
    Closes-Bug: #1881098