ACCUMULO-3213 Archive files that the garbage collector would otherwise delete.
ACCUMULO-3213 Fix the moveToTrash method name to be more accurate (archive or move to trash)
ACCUMULO-3213 Make DeleteTable archive files if configured.

Archiving a table directory is a little more complicated since we
need to account for the potential existence of files for that table
which were already archived. Ultimately, we're merging the table directory
into the correct directory inside the fileArchive directory.
ACCUMULO-3213 Fix up SimpleGarbageCollectorTest