Added ability to get tokudb data log dirs, then add them to backup source list.
Added support for log-bin dir.  Added extra checks for invalid and valid subdirectory configs.
Added extra check against log-bin varialbe being a file prefix or path to file.
Covered more valid subdir cases.  Cleaned up log printing.
DB-722 merge tc-heuristic-recover fix from percona server
Updated status printing of directory mapping to use sql_info.
Refactored dir tree error checking.  Code now only checks if logbin is child of mysql data dir.
Added checks for tokudb data and log dirs being subdirs of mysql data dir.
Added extra checks for custom dirs being parents of mysql's data dir.  Removed dead code.
Added checks for log bin dir being child of either TokuDB log or data dirs.
DB-714 read free replication
DB-714 fix mtr tests due to read free replication
Fixing minor order issue when tokudb log and data are set.