Kolla environment currently uses haproxy
to fullfill HA in mariadb. This patch
is switching haproxy to proxysql if enabled.

This patch is also replacing mariadb's user
'haproxy' with user 'monitor'. This replacement
has two reasons:
  - Use better name to "monitor" galera claster
    as there are two services using this user
    (HAProxy, ProxySQL)
  - Set password for monitor user as it's
    always better to use password then not use.
    Previous haproxy user didn't use password
    as it was historically not possible with
    haproxy and mariadb-clustercheck wasn't
    implemented.

Depends-On: https://review.opendev.org/c/openstack/kolla/+/769385
Depends-On: https://review.opendev.org/c/openstack/kolla/+/765781
Depends-On: https://review.opendev.org/c/openstack/kolla/+/850656

Change-Id: I0edae33d982c2e3f3b5f34b3d5ad07a431162844

Allow operators to set haproxy socket to admin level.
This is done via the flag haproxy_socket_level_admin which
is set to "no" by default.

Closes-Bug: 1960215

Signed-off-by: Imran Hussain <ih@imranh.co.uk>
Change-Id: Ia0da89288d68f5803ace1934c013053f12343195

The check condition is similar to the previous if and it can be merged

Signed-off-by: Seena Fallah <seenafallah@gmail.com>
Change-Id: I62213d91945de42ffc87ecad1e96fa4fc0760f10

For now role haproxy is maintaining haproxy
and keepalived. In follow-up changes there is also
proxysql added.

This patch is *only* renaming/moving stuff to more
prominent role loadbalancer, and moving also specific
templates to subdirectory.

This was done only to better diff in follow-up
changes.

Change-Id: I1d39d5bcaefc4016983bf267a2736b742cc3a555