Remove script to clean up datadirs

This reverts commit 33c055c4f1.
(bitcoin/bitcoin#2295)

(cherry picked from commit bitcoin/bitcoin@fa85de9ff5)

contrib/tidy_datadir.sh

@@ -1,62 +0,0 @@
-#!/bin/bash
-# Copyright (c) 2013 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or https://www.opensource.org/licenses/mit-license.php .
-
-if [ -d "$1" ]; then
-  cd "$1" || exit 1
-else
-  echo "Usage: $0 <datadir>" >&2
-  echo "Removes obsolete Bitcoin database files" >&2
-  exit 1
-fi
-
-LEVEL=0
-if [ -f wallet.dat -a -f addr.dat -a -f blkindex.dat -a -f blk0001.dat ]; then LEVEL=1; fi
-if [ -f wallet.dat -a -f peers.dat -a -f blkindex.dat -a -f blk0001.dat ]; then LEVEL=2; fi
-if [ -f wallet.dat -a -f peers.dat -a -f coins/CURRENT -a -f blktree/CURRENT -a -f blocks/blk00000.dat ]; then LEVEL=3; fi
-if [ -f wallet.dat -a -f peers.dat -a -f chainstate/CURRENT -a -f blocks/index/CURRENT -a -f blocks/blk00000.dat ]; then LEVEL=4; fi
-
-case $LEVEL in
-  0)
-    echo "Error: no Bitcoin datadir detected."
-    exit 1
-    ;;
-  1)
-    echo "Detected old Bitcoin datadir (before 0.7)."
-    echo "Nothing to do."
-    exit 0
-    ;;
-  2)
-    echo "Detected Bitcoin 0.7 datadir."
-    ;;
-  3)
-    echo "Detected Bitcoin pre-0.8 datadir."
-    ;;
-  4)
-    echo "Detected Bitcoin 0.8 datadir."
-    ;;
-esac
-
-FILES=""
-DIRS=""
-
-if [ $LEVEL -ge 3 ]; then FILES=$(echo $FILES blk????.dat blkindex.dat); fi
-if [ $LEVEL -ge 2 ]; then FILES=$(echo $FILES addr.dat); fi
-if [ $LEVEL -ge 4 ]; then DIRS=$(echo $DIRS coins blktree); fi
-
-for FILE in $FILES; do
-  if [ -f $FILE ]; then
-    echo "Deleting: $FILE"
-    rm -f $FILE
-  fi
-done
-
-for DIR in $DIRS; do
-  if [ -d $DIR ]; then
-    echo "Deleting: $DIR/"
-    rm -rf $DIR
-  fi
-done
-
-echo "Done."