"Disable transaction support in Federated storage engine"
  Minimal patch to disable Federated's transactions until they can be fixed.


mysql-test/r/federated.result:
  verify that transactions are disabled
mysql-test/t/disabled.def:
  bug29875
    disable federated_transactions test until Bug#29523 is resolved.
mysql-test/t/federated.test:
  verify that transactions are disabled
storage/federated/ha_federated.cc:
  bug29875
    Disable support for transactions until fixed.
storage/federated/ha_federated.h:
  bug29875
    Disable support for transactions until fixed.