The default connection limits for backends is 2000
however, mariadb defaults to a max of 10000 conections,
therefore changing this limit to match the mariadb limit.

'haproxy_max_connections' also needs to be bumped
for this to work.

Change-Id: I5ded328485855f3f3d4390282040b0d89d08d997

Having all services in one giant haproxy file makes altering
configuration for a service both painful and dangerous. Each service
should be configured with a simple set of variables and rendered with a
single unified template.

Available are two new templates:

* haproxy_single_service_listen.cfg.j2: close to the original style, but
only one service per file
* haproxy_single_service_split.cfg.j2: using the newer haproxy syntax
for separated frontend and backend

For now the default will be the single listen block, for ease of
transition.

Change-Id: I6e237438fbc0aa3c89a3c8bd706a53b74e71904b