Automatically inject Azkaban properties beginning with hadoop-conf into ...

...the Hadoop configuration for HadoopJava, Pig, Hive and Java job types
Hmmm, I realized now that this abstraction wasn't very well designed the first time around. Instead of having a library that we can reuse and having the business logic near the caller, we're putting all the business logic in here.

If we're expecting to do any more development with this feature, we should probably refactor it. As it is now though, it's probably not worth the cost.