MySQL patches by Codership 5.5.29-23.7.3

!!! NOTE: upgrading from rhel5 to rhel6 packages on RHEL/CentOS 6 almost certainly will require upgrade of MySQL-client and MySQL-shared/MySQL-shared-compat RPMs as well.

This is a major bugfix release. Fixed since 23.7:

A whole bunch of foreign key issues:
- lp:1078346: SEGV on wsrep_append_foreign_key()
- lp:1089490: non-uniform FK reference can cause slave crash
- lp:1100496: mixed CHAR and VARCHAR columns in foreign key definition makes parallel applying fail
- lp:1117175: foreign Key problem with PXDBC 5.5.29-23.7.1-387
- lp:1130888: cascading FK constraint can cause slave hanging

A whole host of serious bugs:
- lp:1144911: prepared statements could cause node hanging.
- lp:1019473: tables without primary keys could become inconsistent.
- lp:1112514: updates to temporary tables caused memory leaks
- lp:1088400: binlog_format=STATEMENT could cause server abort with "WSREP: FSM: no such a transition COMMITTING -> REPLICATING"
- lp:1084702: dropping a non-existing temporary table was be replicated
- lp:1132974: wsrep_recover processing conflicts with native replication threads
- lp:1136303: crash executing SHOW STATUS LIKE 'wsrep_%';

And some small fish:
- lp:1108431: wsrep-recover function in mysqld_safe was incompatible with dash on Ubuntu.
- lp:1082406: an explicitly set wsrep_node_incoming_address could make SHOW STATUS LIKE 'wsrep_incoming_addresses' return a portless address
- lp:812059: set FD_CLOEXEC flag on all mysqld file descriptors by default

Plus update to MySQL-5.5.29.