New functions for gen_valid.py.

  - svalid_integer: Improved this to work on hex values.
  - svalid_dir_path:  New function.
  - valid_dir_path:  New function.
  - svalid_file_path:  New function.
  - valid_file_path:  New function.

Change-Id: If990bed0c202651b07cbf86d5c0873827ba4143c
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
1 file changed