ACCUMULO-2566 Fix botched merge

Fixing a bad merge for TeraSortIngest using reflection to get hadoop
configuration objects. Copied the code from InputFormatBase because
the method we need is not visible and adding it to the public API would
be a terrible, terrible thing to do.
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1996 Add some javadocs to SimpleMacIT to define its scope
ACCUMULO-2392 Log the MAC directory used by a test

Add a log message to SimpleMacIT to inform which MiniAccumuloCluster instance is
in use for each SimpleMacIT test, to make it easier to debug a failed test.

Additionally, renamed a trivial helper method to more accurately reflect its
purpose.
ACCUMULO-2470 Clean up warnings introduced by previous commit

(Unused fields and imports)
Merge branch '1.6.0-SNAPSHOT'