component/mariadb: do not install test suite

Test suite is really large ( > 10K files ) and we do not run tests, so
let's save disk space a bit.

component/mariadb/buildout.cfg

@@ -79,6 +79,8 @@ environment =
 post-install =
   mkdir -p @@LOCATION@@/include/wsrep &&
   cp -p wsrep/wsrep_api.h @@LOCATION@@/include/wsrep &&
+  rm -rf @@LOCATION@@/mysql-test/
+# XXX do not install regression test suite (while developping cmmi shared)
 
 [mroonga-mariadb]
 # mroonga - a storage engine for MySQL. It provides fast fulltext search feature to all MySQL users.