Fix a syntax typo
This worked for now, but is SyntaxError in Python 3.9.0a6:
File "/usr/lib/python3.9/site-packages/ipapython/cookie.py", line 222
return'/'
^
SyntaxError: invalid string prefix
(The Python change might actually be reverted before 3.9 final,
but this can be fixed anyway.)
Reviewed-By: Christian Heimes <cheimes@redhat.com>