Remove unicode before sending it to path parser

Fixes 175929456/

util/names.py

@@ -1,6 +1,8 @@
 import urllib
 import re
 
+import anunidecode # Don't listen to pylint's lies. This import is required for unidecode below.
+
 from uuid import uuid4
 
 REPOSITORY_NAME_REGEX = re.compile(r'^[\.a-zA-Z0-9_-]+$')
@@ -23,6 +25,8 @@ def escape_tag(tag, default='latest'):
 
 
 def parse_namespace_repository(repository, library_namespace, include_tag=False):
+  repository = repository.encode('unidecode', 'ignore')
+
   parts = repository.rstrip('/').split('/', 1)
   if len(parts) < 2:
     namespace = library_namespace