Title: #875: 1.16 backport of https://github.com/SSSD/sssd/pull/866
Changed field: body
The code had to change a lot and when on it I also converted
autofs responder to use cache req.
The logic is now:
* `setautomntent`: downloads only the map object to see if it exist
* `getautomntent`: enumerates the map and maintains enumeration context
* `getautomntbyname`: downloads sinle autofs entry