This fixes a problem introduced in 18410c86 where ruletype is specified
as a string not a list.
Fixes:
>>> sepolicy.get_all_role_allows()
Traceback (most recent call last):
File "/usr/lib64/python3.6/site-packages/setools/policyrep/util.py", line 60, in lookup
return cls(value)
File "/usr/lib64/python3.6/enum.py", line 291, in __call__
return cls.__new__(cls, value)
File "/usr/lib64/python3.6/enum.py", line 533, in __new__
return cls._missing_(value)
File "/usr/lib64/python3.6/enum.py", line 546, in _missing_
raise ValueError("%r is not a valid %s" % (value, cls.__name__))
ValueError: 'a' is not a valid RBACRuletype
Signed-off-by: Petr Lautrbach <plautrba@redhat.com>