sphinx.so module is not available, so do not use it until it is built correctly

This mysql init function is called by mariadb_update script before
setting up mariadb user accounts. Since sphinx was not available,
the mariadb_update script failed, then account were not set, then
test were failing since there were not allowed to access mariadb
databases

slapos/recipe/generic_mysql/template/mysql-init-function.sql.in

@@ -2,4 +2,4 @@ USE mysql;
 DROP FUNCTION IF EXISTS last_insert_grn_id;
 CREATE FUNCTION last_insert_grn_id RETURNS INTEGER SONAME 'ha_mroonga.so';
 DROP FUNCTION IF EXISTS sphinx_snippets;
-CREATE FUNCTION sphinx_snippets RETURNS STRING SONAME 'sphinx.so';
+#CREATE FUNCTION sphinx_snippets RETURNS STRING SONAME 'sphinx.so';