[HBASE-20331] clean up shaded packaging for 2.1 - ASF JIRA

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polishing pass on shaded modules for 2.0 based on trying to use them in more contexts.

1.	shaded mapreduce module shouldn't include hadoop	Resolved	Sean Busbey
2.	break up shaded client into one with no Hadoop and one that's standalone	Resolved	Sean Busbey
3.	emphasize use of shaded client jars when they're present in an install	Resolved	Sean Busbey
4.	add a test that expressly uses both our shaded client and the one from hadoop 3	Resolved	Sean Busbey