This reverts commit 91321ac8ff342ad8276c6874f85b7ad3a823a444.
The reasoning given in this commit is incorrect. Keystone/oslo.cache
uses memcached hosts based on a hashing of the key to determine which
memcached host to check. If you have different configured memcached
servers per keystone deployment you have a mis-configured deployment.
Any RESTapi should be capable of roundrobin load-balancing. I am not
familiar with the Murano case with uploading a package, but this change
also does not address Murano at all.
As far as Horizon goes, that hasn't had a problem with shared backends
since the beginning because we use memcached servers with a shared
secret key [1].
All this change has done is lowered the efficiency of loadbalancing
keystone.
[1] https://github.com/openstack/kolla-ansible/blob/master/ansible/roles/horizon/templates/local_settings.j2#L149
Change-Id: Ic0b550e7c96d67c39153933b527ab3edf7d90f27
0fc512e0fe