added request for DB Server on update
Please review this as I don't know if there was any incompatible reason why db was always enabled hard coded or if it's just as it would have been detected anyways as it's always on a ISPC-Server.
If you and ISPC are fine with probably getting a value $conf['services']['db']
which is false
on user behalf, then just merge without any further request.
Merging this really and ultimately fixes #4050 (closed)