[freeipa PR#701][comment] ipa help doesn't always work

[neffs]

URL: https://github.com/freeipa/freeipa/pull/701
Title: #701: ipa help doesn't always work

neffs commented:
"""
Not sure why pylint is reporting this, it looks fine to me and I didn't change this function.
```python
        if isinstance(self._help, bytes):
            self._help = json.loads(self._help.decode('utf-8'))
```

maybe we can trick it with a change like this (similar to read_namespace_member):
```python
        value = self._help
        if isinstance(value, bytes):
            self._help = json.loads(value.decode('utf-8'))
```
"""

See the full comment at https://github.com/freeipa/freeipa/pull/701#issuecomment-304273513