Make lowercase_table2 experimental due to Bug 55509.

mysql-test/collections/default.experimental

@@ -14,6 +14,7 @@ main.information_schema                  # Bug#47449 2009-09-19 alik main.inform
 main.lock_multi_bug38499                 # Bug#47448 2009-09-19 alik main.lock_multi_bug38499 times out sporadically
 main.lock_multi_bug38691 @solaris        # Bug#47792 2009-10-02 alik main.lock_multi_bug38691 times out sporadically on Solaris 10
 main.log_tables                          # Bug#47924 2009-10-08 alik main.log_tables times out sporadically 
+main.lowercase_table2 @darwin            # Bug#55509 2010-07-26 alik main.lowercase_table2 fails on Mac OSX (again)
 main.mysqlbinlog_row @solaris            # Bug#52202 2010-03-22 alik mysqlbinlog_row* fail in daily-trunk on Sol10 x86_64 debug_max
 main.mysqlbinlog_row_innodb @solaris     # Bug#52202 2010-03-22 alik mysqlbinlog_row* fail in daily-trunk on Sol10 x86_64 debug_max
 main.mysqlbinlog_row_myisam @solaris     # Bug#52202 2010-03-22 alik mysqlbinlog_row* fail in daily-trunk on Sol10 x86_64 debug_max