Merge branch 'master' into erp5-component
version up : SQLite 3.7.17.
version up : zlib 1.2.8.
version up : git 1.8.2.3.
disable MariaDB query cache completely by 'query_cache_type = 0' for ERP5.
enable haproxy admin socket and install haproxyctl script.

with this, we can manually disable/enable a backend node so that we
can safely restart it.
Merge remote-tracking branch 'master' into erp5-component
version up : groonga-3.0.4 and mroonga-3.04.
increase the maximum number of open file descriptors before starting mysqld.

so that we can really have max_connections=1000 as written in mariadb.cnf.
Merge branch 'master' into erp5-component
Merge branch 'erp5-component' into erp5