Fix for duplicate entries with pkrepo.managed

pkgrepo.managed creates duplicate entries every time salt runs
  when the same repository is set up twice, with different file attributes.

  This change simply removes the file attributes before comparing if the
  repo already exists.

  This might be related to #22412.

salt/states/pkgrepo.py

@@ -377,6 +377,9 @@ def managed(name, ppa=None, **kwargs):
         repo = salt.utils.pkg.deb.strip_uri(repo)
 
     if pre:
+        #22412: Remove file attribute in case same repo is set up multiple times but with different files
+        pre.pop('file', None)
+        sanitizedkwargs.pop('file', None)
         for kwarg in sanitizedkwargs:
             if kwarg not in pre:
                 if kwarg == 'enabled':