Bumping master version up to 1.7.0
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-1761 added test for disk usage over multiple volumes
Merge branch '1.6.0-SNAPSHOT'
Revert "ACCUMULO-1761 use file size information from !METADATA instead of asking the namenode, avoids using ServerConstants.getTablesDirs()"

This reverts commit dcb559165b587eca9e5bf0b64df8031c748d3f37.
ACCUMULO-1761 learn table directories from the !METADATA table scan
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-1853 Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-1874 Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
Merge branch '1.6.0-SNAPSHOT'
ACCUMULO-1867 use the correct file system when reading the indexes of existing files
Merge branch '1.6.0-SNAPSHOT'