RBD driver: remove 'rbd_keyring_conf' option

Registered by Brian Rosmaita

See OSSN-0085. Option was deprecated in Ussuri by Change-Id: I345a3b4bf3b328b0e547016f481518d252f734b9

The proposal was to remove the option early in the Victoria development cycle without replacement for the functionality. It was announced on the ML [0,1] in December 2019, with no objections being stated, so let's go ahead and remove it.

NOTE: this will require some coordination with cinderlib, which I believe actually does use this option.
==> The cinderlib side of this has been handled by Change-Id: I7d3324e14494540f8c0d714682e1d0065c1735e3

[0] http://lists.openstack.org/pipermail/openstack-discuss/2019-December/011419.html
[1] http://lists.openstack.org/pipermail/openstack-announce/2019-December/002025.html

Blueprint information

Status:
Complete
Approver:
None
Priority:
Low
Drafter:
Brian Rosmaita
Direction:
Needs approval
Assignee:
Brian Rosmaita
Definition:
Approved
Series goal:
Accepted for victoria
Implementation:
Implemented
Milestone target:
milestone icon victoria-3
Started by
Brian Rosmaita
Completed by
Brian Rosmaita

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Gerrit topic: https://review.opendev.org/#/q/topic:remove-opt-causing-ossn-0085

Addressed by: https://review.opendev.org/747494
    RBD: remove rbd_keyring_conf option

Gerrit topic: https://review.opendev.org/#/q/topic:remove-rbd_keyring_conf

Addressed by: https://review.opendev.org/738216
    RBD: cinderlib support for rbd_keyring_conf option

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