Detect globally writable files in the module directory

[bu-bgregor]

per our discussion...

• in module_check.py, pass the env vars dictionary returned from check_module_env() to a new func
• in that func find the SCC_NAME_DIR variable
• make a new "module_files.py" file or something with the functions that check for global writability.
• os.walk can be used to walk the directory tree, something like:

  for val in os.walk('/path/to/module/install'):
  # val --> (dir, [sub_dirs], [files]
  # Sample of "val":
  #  ('/share/pkg.8/module_check/0.5', ['install', 'DIST', 'test', 'build', 'src'], ['modulefile.lua', 'notes.txt'])
  # 1) check val[0] for global writability
  # then..
  for file in val[2]:
      path = os.path.join(val[0],file)
      #check path for global writability

Add a new moduleloadtest version (with a non-numeric name) with a globally writable file lurking within.

[bu-bgregor]

Seamus found the Python os.stat() function, it returns a "stat_result" that has the req'd info: https://docs.python.org/3.6/library/os.html#os.stat_result