[YARN] Fix issue with port-offsetting.
[doc] Fix javadoc building.

The java8 Xdoclint:none fix was not correctly transferred when moving
the javadoc building to a jekyll plugin.
[doc] Update programming guide for scala expression keys
Fix bug in Blob Manager, Cleanup Timer was not cancelled on Shutdown                                          -
Remove Guava dependecy from streaming-connectors (void shading otherwise)
Enable forgotten JoinITCase (for POJOs) for Scala and Java API
Set the cleanup timer thread of the BlobLibraryCacheManager to be a daemon.
Fix class loader when extracting lambdas