Failure&Cancellation tests for initial start_metadata_sync() calls
to worker and DDL queries that send metadata syncing messages to an MX node
Also adds message type definitions for messages that are exchanged
during metadata syncing
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- Lots of detail is in src/test/regress/mitmscripts/README
- Create a new target, make check-failure, which runs tests
- Tells travis how to install everything and run the tests