erp5: take test databases into account of default max-connection-count [WIP]

Also stop generating test databases when test runner is not enabled.

stack/erp5/buildout.hash.cfg

@@ -78,7 +78,7 @@ md5sum = d41d8cd98f00b204e9800998ecf8427e
 
 [template-erp5]
 filename = instance-erp5.cfg.in
-md5sum = ff5e0d8d1ca167399fb438e890baf370
+md5sum = f6cae0ac548c6d86944b1570a6466694
 
 [template-zeo]
 filename = instance-zeo.cfg.in

stack/erp5/instance-erp5.cfg.in

@@ -19,6 +19,9 @@
 {%   set test_runner_total_database_count = mariadb_test_database_amount %}
 {%   set test_runner_enabled = mariadb_test_database_amount > 0 %}
 {% endif -%}
+{% if not test_runner_enabled -%}
+{%   set test_runner_total_database_count = 0 %}
+{% endif -%}
 {% set monitor_base_url_dict = {} -%}
 {% set monitor_dict = slapparameter_dict.get('monitor', {}) %}
 {% set use_ipv6 = slapparameter_dict.get('use-ipv6', False) -%}
@@ -115,7 +118,7 @@ backup-caucased = ${:srv}/backup/caucased
     'max-slowqueries-threshold': monitor_dict.get('max-slowqueries-threshold', 1000),
     'slowest-query-threshold': monitor_dict.get('slowest-query-threshold', ''),
     'test-database-amount': test_runner_total_database_count,
-    'max-connection-count': sum(partition_thread_count_list) * 5 + 50,
+    'max-connection-count': (sum(partition_thread_count_list) + test_runner_total_database_count) * 5 + 50,
   },
   {
     'database-list': True,