ACCUMULO-2913 More replication test stabilization.

Remove commented code, retry some checks for replication data a few times before
failing the test, and remove the defaultTimeoutSeconds because it was overriding
what was actually configured in the JUnit timeout annotation.
ACCUMULO-2923 TableIDs are hex, not numeric. Change remoteTableId from i32 to string.
ACCUMULO-2922 unit test LargestFirstMemoryManager
ACCUMULO-2854 Added additional check to prevent NPE

Signed-off-by: Bill Havanki <bhavanki@cloudera.com>
Merge branch '1.6.1-SNAPSHOT'

Conflicts:
	server/master/src/main/java/org/apache/accumulo/master/tableOps/BulkImport.java