[Doc] Create share from snapshot in another pool or backend

[Douglas Viroel]

Description
===========
Provide documentation update regarding changes proposed in:
https://review.opendev.org/#/c/709697/

Create share from snapshot in another pool or backend

This patch enables the creation of a share from snapshot
specifying another pool or backend. In the scheduler, a
new filter and weigher were implemented in order to consider
this operation if the backend supports it. Also, a new
field called 'progress' was added in the share and share
instance. The 'progress' field indicates the status
of the operation create share from snapshot (in percentage).
Finally, a new periodic task was added in order to constantly
check the share status.

Partially-implements: bp create-share-from-snapshot-in-another-pool-or-backend

DOCImpact
Change-Id: Iab13a0961eb4a387a502246e5d4b79bc9046e04b
Co-authored-by: carloss <email address hidden>
Co-authored-by: dviroel <email address hidden>

[Goutham Pacha Ravi (gouthamr)]

Additional comments at http://eavesdrop.openstack.org/meetings/manila/2020/manila.2020-05-14-15.00.log.html#l-98

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/729991

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/729991
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=6b8f416e1b20b82617ecd4feff9cbc1c5d914c25
Submitter: Zuul
Branch: master

commit 6b8f416e1b20b82617ecd4feff9cbc1c5d914c25
Author: Douglas Viroel <email address hidden>
Date: Tue May 12 19:12:30 2020 +0000

    Update docs for create share from snapshot in another back end

    This patch add some notes regarding the use of scheduler when
    creating share from snapshot in another pool or backend.

    Change-Id: I8d904cb3aab4d653178948284571f471bd59ac1b
    Closes-Bug: #1878244

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ussuri
Review: https://review.opendev.org/747338

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/747338
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=b8e1b9654cf2a7f047fdf146d7148a7d56c8f1a3
Submitter: Zuul
Branch: stable/ussuri

commit b8e1b9654cf2a7f047fdf146d7148a7d56c8f1a3
Author: Douglas Viroel <email address hidden>
Date: Tue May 12 19:12:30 2020 +0000

    Update docs for create share from snapshot in another back end

    This patch add some notes regarding the use of scheduler when
    creating share from snapshot in another pool or backend.

    Change-Id: I8d904cb3aab4d653178948284571f471bd59ac1b
    Closes-Bug: #1878244
    (cherry picked from commit 6b8f416e1b20b82617ecd4feff9cbc1c5d914c25)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/manila 10.0.2 release.