[PLAT-6762] Delete unsupported test of old engine

ExamplesAvailablePortfolioOutputsTest tests old engine
funcionality and is no longer supported.
[PLAT-6750] Delete unsupported test of old engine

RemoteEngineContextsComponentFactoryTest tests unsupported old
engine functionality.
Merge pull request #230 from OpenGamma/topic/PLAT-6762

Deleted tests of unsupported old engine functionality