remove unused library

trivial modify

Change-Id: I27d5b85d2c745fee5ff0643e7771b46faebd23a6

tools/cleanup-images

 #!/bin/bash
 
 # Move to top level directory
-REAL_PATH=$(python -c "import os,sys;print os.path.realpath('$0')")
+REAL_PATH=$(python -c "import os;print os.path.realpath('$0')")
 cd "$(dirname "$REAL_PATH")/.."
 
 function process_cmd {