pylint3: workaround false positives reported for W1662

Pylint3 falsely reports warning W1662: using a variable that was bound
inside a comprehension for the cases where the same name is reused for a
loop after the comprehension in question.

Rename the variable in a loop to avoid it.

If the code looks like the following:

  arr = [f for f in filters if callable(f)]
  for f in arr:
      result = result + f()

pylint3 would consider 'f' used outside of comprehension. Clearly, this
is a false-positive warning as the second 'f' use is completely
independent of the comprehension's use of 'f'.

Reviewed-By: Aleksei Slaikovskii <aslaikov@redhat.com>

ipapython/ipautil.py

@@ -496,7 +496,7 @@ def run(args, stdin=None, raiseonerr=True, nolog=(), env=None,
             pent = pwd.getpwnam(runas)
 
             suplementary_gids = [
-                grp.getgrnam(group).gr_gid for group in suplementary_groups
+                grp.getgrnam(sgroup).gr_gid for sgroup in suplementary_groups
             ]
 
             logger.debug('runas=%s (UID %d, GID %s)', runas,