Cinder caching is disabled by default

[Brent Rowsell]

Brief Description
-----------------
Support to enable cinder caching was added to openstack helm by https://review.opendev.org/#/c/647493/ . However, the helm overrides were not updated in startlingx to enable this by default.

Severity
--------
Major

Steps to Reproduce
------------------
N/A

Expected Behavior
------------------
N/A

Actual Behavior
----------------
N/A

Reproducibility
---------------
100%

System Configuration
--------------------
All

Branch/Pull Time/Commit
-----------------------
Master

Last Pass
---------
N/A

Timestamp/Logs
--------------
N/A

Test Activity
-------------
N/A

[Ghada Khalil (gkhalil)]

Marking as stx.2.0 based on input from Brent Rowsell. The openstack-helm feature was implemented by Liang Fang, but he didn't enable the feature thru a helm override in stx.

[Liang Fang (liangfang)]

Fixed and tested in starlingx iso 20190708. Some logs:
------------------------------------------
[sysadmin@controller-0 ~(keystone_admin)]$ kubectl exec -n openstack -it cinder-volume-d5f78cf5c-v75ns bash
bash-4.2$ cat /etc/cinder/cinder.conf | grep cache
image_volume_cache_enabled = True
memcache_secret_key = 3b9b6f3e5e21Ti0*
memcache_security_strategy = ENCRYPT
memcached_servers = memcached.openstack.svc.cluster.local:11211
bash-4.2$
------------------------------------------

Code review sent out at: https://review.opendev.org/#/c/672203/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/672203
Committed: https://git.openstack.org/cgit/starlingx/config/commit/?id=942d3331cc1db071c10624cba1688f83933eb986
Submitter: Zuul
Branch: master

commit 942d3331cc1db071c10624cba1688f83933eb986
Author: Liang Fang <email address hidden>
Date: Sun Jul 21 14:41:42 2019 +0800

    Enable cinder raw cache by default

    Support to enable cinder raw cache feature was added to openstack helm
    by https://review.opendev.org/#/c/647493/. This patch is to enable this
    feature in Starlingx by default.

    Refer to cinder raw cache feature:
    https://docs.openstack.org/cinder/latest/admin/blockstorage-image-volume-cache.html

    Closes-Bug: #1837107
    Change-Id: I5277063a7a924b1791f00d27921d2267b52acb7d
    Signed-off-by: Liang Fang <email address hidden>