Permit - in URL schemes for special URLs

Clients might be using their own special git-remote-* helper that
has a hypen in its name. Permit - in the scheme part of the URL
when trying to decide if it is an SSH URL and assume it is *not*
SSH if the URL matches "foo-bar://" style.

Change-Id: I7ba2d810a614f6e605a441d5972902c4a14e73fd
diff --git a/git_config.py b/git_config.py
index 1793764..eb532d0 100644
--- a/git_config.py
+++ b/git_config.py
@@ -488,7 +488,7 @@
   _master_keys_lock = None
 
 URI_SCP = re.compile(r'^([^@:]*@?[^:/]{1,}):')
-URI_ALL = re.compile(r'^([a-z][a-z+]*)://([^@/]*@?[^/]*)/')
+URI_ALL = re.compile(r'^([a-z][a-z+-]*)://([^@/]*@?[^/]*)/')
 
 def GetSchemeFromUrl(url):
   m = URI_ALL.match(url)