erp5.mariadb: Explicitly disable innodb_file_per_table .

MySQL changed the default value 3 times since 5.1, causing a waste of disk
space when recreating schemas (tables move out of an already large system
tablespace, which cannot be easily reclaimed).
Also, per-table option fragments free space: if a table shrinks, freed
space cannot be used by another table without recreating shrunk table
(which induces at least a write-lock during data copy, which may not be
trivial).

stack/erp5/buildout.cfg

@@ -208,7 +208,7 @@ md5sum = 43b27a5e9c641ab780a083223c693d04
 [template-my-cnf]
 < = download-base
 filename = my.cnf.in
-md5sum = 8c2248ab9c8584dfc7d6c336c5ba0f0c
+md5sum = dd779e54d22105702aa72cadc994d957
 
 [template-mariadb-initial-setup]
 < = download-base

stack/erp5/my.cnf.in

@@ -30,6 +30,7 @@ slow_query_log_file = {{ parameter_dict['slow-query-log'] }}
 long_query_time = {{ parameter_dict['long-query-time'] }}
 max_allowed_packet = 128M
 query_cache_size = 32M
+innodb_file_per_table = 0
 
 plugin_load = ha_mroonga.so;handlersocket.so