Generate streaming tag in mapreduce job

If the configuration values indicate streaming for a mapreduce
job, then generate the <streaming> tag in the workflow with the
specified mapper and reducer values.

Implements: blueprint edp-oozie-streaming-mapreduce
Change-Id: I53926b1d7a1eeff83ca60d1224882e229ded35c3
Add validation check for streaming elements on MapReduce without libs

Partial-implements: blueprint edp-oozie-streaming-mapreduce
Change-Id: Ie83b84d1b48bf236eb78b1d1592e03c170841fcf
Merge "Generate streaming tag in mapreduce job"
Merge "Add validation check for streaming elements on MapReduce without libs"