pylint: Skip redundant-u-string-prefix
    
    Pylint 2.10 introduced new checker `redundant-u-string-prefix`:
    > Used when we detect a string with a u prefix. These prefixes were
      necessary in Python 2 to indicate a string was Unicode, but since Python
      3.0 strings are Unicode by default.
    
    There are ~31K emitted warnings right now. They can be fixed on
    refactorings without any rush.
    
    Fixes: https://pagure.io/freeipa/issue/9117
    Signed-off-by: Stanislav Levin <slev@altlinux.org>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>