Ticket #49072: memberOf fixup task does not validate args
    
    Description: Added test cases to validate memberOf fixup task for both
    invalid filter and invalid basedn
    
    https://pagure.io/389-ds-base/issue/49072
    
    Reviewed by: spichugi
    
    Signed-off-by: Simon Pichugin <spichugi@redhat.com>