Fixes to get all test to run on MacosX Lion 10.7

This includes fixing all utilities to not have any memory leaks,
as safemalloc warnings stopped tests from passing on MacOSX.

- Ensure that all clients takes character-set-dir, as the
  libmysqlclient library will use it.
- mysql-test-run now passes character-set-dir to all external clients.
- Changed dynstr_free() so that it can be called twice (made freeing code easier)
- Changed rpl_global_gtid_slave_state to be allocated dynamicly as it
  includes a mutex that needs to be initizlied/destroyed before my_end() is called.
- Removed rpl_slave_state::init() and rpl_slave_stage::deinit() as
  their job are better handling by constructor and delete.
- Print alias instead of table_name in check_duplicate_key as
  table_name may have been converted to lower case.

Other things:
- Fixed a case in time_to_datetime_with_warn() where we where
  using && instead of & in tests

mysql-test/suite/innodb/r/innodb_bug56947.result

@@ -2,7 +2,7 @@ SET GLOBAL innodb_file_per_table=0;
 create table bug56947(a int not null) engine = innodb;
 SET DEBUG_DBUG='+d,ib_rebuild_cannot_rename';
 alter table bug56947 add unique index (a);
-ERROR HY000: Got error 11 "Resource temporarily unavailable" from storage engine InnoDB
+ERROR HY000: Got error 11 "xxx" from storage engine InnoDB
 SET DEBUG_DBUG='-d,ib_rebuild_cannot_rename';
 check table bug56947;
 Table	Op	Msg_type	Msg_text