Deny access to public /server-status in http Openstack services

This change block access to the public /server-status url on all
http services exposed by HAProxy, also fixes an issue with Horizon
where 'Require all granted' open access to the /server-status in
the HAProxy-less configurations. Without this change the issue
affects only Ubuntu/Debian installations where mod_status in Apache2
enabled by default.

Closes-Bug: #1996913
Change-Id: I3ec1af6353c3ecc64589599abe375b0ae9b14d5c
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>