ACCUMULO-2476, ACCUMULO-2342 Sleep after we modify a constraint. -- cherry-picked d4b06999 back to 1.4
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	proxy/src/test/java/org/apache/accumulo/proxy/SimpleProxyIT.java
Merge remote-tracking branch 'origin/1.6.0-SNAPSHOT' into ACCUMULO-2061
ACCUMULO-2484 Allow the invoker of runTest to pass in a unique suffix
Merge branch '1.6.0-SNAPSHOT' into ACCUMULO-2061
ACCUMULO-2468 Remove recently introduced warnings
ACCUMULO-2437 Add javadoc for addSplits that documents the workaround using Text's byte[] constructor.
ACCUMULO-2492 add time for zookeeper propogation
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2460 hide experimental props in shell
ACCUMULO-2460 removed empty javadoc
ACCUMULO-2488 Change criteria for unbalanced servers in concurrent randomwalk

The Concurrent randomwalk test used to consider servers unbalanced if any server's
tablet count differed from the cluster average by more than a fifth of the average or
by one, whichever was larger. This would cause failures under typical balancings from
the default balancer.

This commit changes the criterion for an unbalanced server to be double the standard
deviation from the cluster average.
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2491 Correct table user state upon termination of Security randomwalk

A partial backport of ACCUMULO-1162 to 1.4 - commit e93a11a only. As the Security randomwalk
ends and drops the table user, it now also sets the user's existence flag to false.
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT (-sours)
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
Merge branch '1.6.0-SNAPSHOT' into ACCUMULO-2061
ACCUMULO-2061 A few more minor fixes from reviewboard.

Fixed a PrintInfo comment. Expand the VolumeImpl.isValidPath javadoc
and implementation to be more encompassing. Suppress warnings in VolumeIT.
Remove implementation of isValidPath from NonConfiguredVolume as it
could be misleading.