ACCUMULO-1053 handle unexpected file system types

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1448315 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1053 force logger to write something before attempting recursive defineTablet flushes

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1448316 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1053 merge to trunk

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1448336 13f79535-47bb-0310-9956-ffa450edef68