ACCUMULO-2654 Adds utility for creating empty rfile.
Merge branch '1.4.6-SNAPSHOT' into 1.5.2-SNAPSHOT
ACCUMULO-2654 Update empty rfile utility to use jcommander.
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/file/rfile/RFileOperations.java
ACCUMULO-2654 adds a IT to the functional suite to cover recovery via empty rfile.

Had to update to use bcfile.Compression directly, since TFile ceased to be.
ACCUMULO-1219 Updated troubleshooting to include actions for corrupt rfiles.

Signed-off-by: Sean Busbey <busbey@cloudera.com>
ACCUMULO-2713 checking for all sensitive and raw output stream for walogs