ACCUMULO-1892 changes RandomBatchWriter to ensure it writes the specified number of rowids.

Signed-off-by: Keith Turner <kturner@apache.org>
ACCUMULO-1890 Clean up the test to avoid spinning up a MAC
ACCUMULO-1890 Forgot to re-add changes before commit
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	examples/simple/src/main/java/org/apache/accumulo/examples/simple/client/RandomBatchWriter.java
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	minicluster/src/test/java/org/apache/accumulo/minicluster/MiniAccumuloClusterGCTest.java