ACCUMULO-1565 attempt to fix bug by changing CloneTable to read empty-string as an equivalent to null when excluding properties
ACCUMULO-1565 applying Sean Hickey's patch
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/accumulo
ACCUMULO-802 fixed ACCUMULO-1565 so updated namespace-specific stuff to work correctly with cloning
ACCUMULO-802 fixing merge issues
ACCUMULO-802 fixed tests to work correctly for cloning namespaces