`teamcity` reporter should handle `uncaughtException` and `suite:error`

[dominykas]

If the test suite run emits an uncaughtException or suite:error, they will quietly go down into the void. They exceptions should be printed somewhere.

[GCheung55]

teamcity reporter is now the xml reporter. It looks like the reporter prints out the uncaught exceptions, but buster-test doesn't exist with error code 1, when it should.

[dominykas]

stalebot-ing myself.