ACCUMULO-3286 Get some more output on conditional writer. Don't have enough info as to why it failed.
Merge branch '1.6'
ACCUMULO-3280 Clean up Initialize

  Stop creating unneeded metadata table dirs on every volume.
  Limit the impact of warnings suppression when using deprecated items.
  Remove redundant call to configure metadata tables in ZooKeeper.
  Improve log message for fs.defaultFS being file:///
  Remove redundant check for directory existance when creating some dirs.
  Ensure root tablet dir is UTF-8 encoded in ZooKeeper.
  Simplify methods to write out initial root tablet content.
ACCUMULO-3287 Retry creation of the MAC if we can't start ZK
Merge branch '1.6'

Conflicts:
	server/base/src/main/java/org/apache/accumulo/server/ServerConstants.java
	server/base/src/main/java/org/apache/accumulo/server/init/Initialize.java
Merge remote-tracking branch 'origin/master'