This update contains the following changes that prevent subclouds
going offline due to authentication failure:
1. The os region client cache is cleared when a new keystone client
is created. The os region client will be re-created using the new
keystone session.
2. When the user's access info (such as role id) is changed create
new keystone client and os region clients. This could happen after
system controller keystone role ids were synced to subclouds
3. Remove get_admin_backup_session that was only required when
upgrading to stx 4.0.
4. Increase AVAIL_FAIL_COUNT_TO_ALARM to 2 as we don't want to alarm
first failure since there are cases where we expect a transient
failure in the subcloud (e.g. haproxy process restart to update
certificates)
Tested on DC-6:
1. Adding 50 subclouds twice
2. Soaking the fix over the weekend
Closes-Bug: 1927007
Signed-off-by: Tao Liu <tao.liu@windriver.com>
Change-Id: I86fdc9a2f062409e704bdfac2119dc488123f7de
(cherry picked from commit 17b5505d9e)
d8ce118e50