Supports all valid protos for remote sources

Fixes saltstack#13971

salt/modules/config.py

@@ -7,7 +7,6 @@
 from __future__ import absolute_import, print_function, unicode_literals
 import copy
 import fnmatch
-import re
 import os
 import logging
 
@@ -129,10 +128,10 @@ def valid_fileproto(uri):
 
         salt '*' config.valid_fileproto salt://path/to/file
     '''
-    try:
-        return bool(re.match('^(?:salt|https?|ftp)://', uri))
-    except Exception:
-        return False
+    return (
+        six.moves.urllib.parse.urlparse(uri).scheme in
+        salt.utils.files.VALID_PROTOS
+    )
 
 
 def option(

salt/modules/cp.py

@@ -492,7 +492,7 @@ def cache_file(path, saltenv='base', source_hash=None):
 
     contextkey = '{0}_|-{1}_|-{2}'.format('cp.cache_file', path, saltenv)
 
-    path_is_remote = _urlparse(path).scheme in ('http', 'https', 'ftp')
+    path_is_remote = _urlparse(path).scheme in salt.utils.files.REMOTE_PROTOS
     try:
         if path_is_remote and contextkey in __context__:
             # Prevent multiple caches in the same salt run. Affects remote URLs

salt/modules/win_pkg.py

@@ -1522,7 +1522,7 @@ def install(name=None, refresh=False, pkgs=None, **kwargs):
             continue
 
         # Is the installer in a location that requires caching
-        if installer.startswith(('salt:', 'http:', 'https:', 'ftp:')):
+        if __salt__['config.valid_fileproto'](installer):
 
             # Check for the 'cache_dir' parameter in the .sls file
             # If true, the entire directory will be cached instead of the