Rewrite unbound remotecontrol.conf when it is empty. Fixes #9470
(cherry picked from commit 4b70a2006e6afb7813344eec8cafb8570e67256b)
Rewrite unbound remotecontrol.conf when it is empty. Fixes #9470
(cherry picked from commit 4b70a2006e6afb7813344eec8cafb8570e67256b)