- Changing Mroonga maturnity from STABLE to BETA

- removing libmysql/libmysql.version from .bzrignore,
  as we don't have this file any more

.bzrignore

@@ -1466,7 +1466,6 @@ storage/mroonga/vendor/groonga/src/groonga
 storage/mroonga/vendor/groonga/src/groonga-benchmark
 storage/mroonga/vendor/groonga/src/suggest/groonga-suggest-create-dataset
 storage/mroonga/vendor/groonga/vendor/plugins/groonga-normalizer-mysql/groonga-normalizer-mysql.pc
-libmysql/libmysql.version
 libmysql/libmysql_versions.ld
 scripts/mysql_config.pl
 pcre/pcre_chartables.c

storage/mroonga/ha_mroonga.cpp

@@ -156,7 +156,7 @@ static pthread_mutex_t *mrn_LOCK_open;
 #  define st_mysql_plugin           st_maria_plugin
 #  define mrn_declare_plugin(NAME)  maria_declare_plugin(NAME)
 #  define mrn_declare_plugin_end    maria_declare_plugin_end
-#  define MRN_PLUGIN_LAST_VALUES    MRN_VERSION, MariaDB_PLUGIN_MATURITY_STABLE
+#  define MRN_PLUGIN_LAST_VALUES    MRN_VERSION, MariaDB_PLUGIN_MATURITY_BETA
 #  define MRN_ABORT_ON_WARNING(thd) thd_kill_level(thd)
 #else
 #  define mrn_declare_plugin(NAME)  mysql_declare_plugin(NAME)