Better tuning for haproxy config

Now uses /status as it should have initially, sets to host with
least connections which is good behavior for http usage

ext/haproxy/service.yml.fragment

@@ -3,7 +3,8 @@
       haproxy_backend_nodes: "{{ groups['gnocchi_all'] | default([]) }}"
       haproxy_port: 8041
       haproxy_balance_type: http
+      haproxy_balance_alg: leastconn
       haproxy_backend_options:
         - "forwardfor"
-        - "httpchk /versions"
+        - "httpchk /status"
         - "httplog"

templates/gnocchi-api-paste.ini.j2

@@ -13,7 +13,6 @@ oslo_config_project = gnocchi
 
 [filter:healthcheck]
 paste.filter_factory = oslo_middleware:Healthcheck.factory
-path = /versions
 backends = disable_by_file
 disable_by_file_path = {{ gnocchi_healthcheck_disable_path }}