ACCUMULO-2726 Adds back missing methods for binary backwards compat with non-Deprecated methods from 1.5.0. Marks things that we're for sure removing with @Deprecated; mostly things that shouldn't have been in public to begin with.
ACCUMULO-2734 Fix trivial javadoc bug
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2726 missed a deprecation for part of Mock.
Merge branch '1.6.0-SNAPSHOT'

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/admin/InstanceOperationsImpl.java
	core/src/main/java/org/apache/accumulo/core/client/admin/SecurityOperationsImpl.java
	core/src/main/java/org/apache/accumulo/core/client/admin/TableOperationsHelper.java
	core/src/main/java/org/apache/accumulo/core/client/admin/TableOperationsImpl.java
	shell/src/main/java/org/apache/accumulo/shell/mock/MockShell.java
ACCUMULO-2171 Update CHANGES for 1.6.0-RC4

  This task also removes some previously added issues which were not actually
  addressed in that version.
ACCUMULO-2726 cleanup for master's branch.

* remove things we deprecated in 1.6.0 related to this ticket.
* make sure changes in the implementations in master are reflected in the new implementation locations
* make names in Mock consistent
Merge branch '1.6.0-SNAPSHOT'