Generating nextdns config must happen after stopping current ctrld
process. Otherwise, config processing may pick wrong IP+Port.
While at it, also making logging better when updating listener config:
- Change warn to info, prevent confusing that "something is wrong".
- Do not emit info when generating working default config, which may
cause duplicated messages printed.
The provision token is only used once, then do not have any effect after
Control D uid is fetched. So making it appears in "ctrld run" command is
useless.
VPN clients often have empty MAC address, because they come from virtual
network interface. However, there's other setup/devices also create
virtual interface, but is not VPN.
Changing source of those clients to empty to prevent confustion in
clients list command output.
RMM uses non-user account which results in config + socket file being
written to a random directory, which is not a real directory that can be
accessed.
Fix this by using directory of ctrld binary as user home dir.
Using the same approach as in cd mode, but do it only once when running
ctrld the first time, then the config will be re-used then.
While at it, also adding Dockerfile.debug for better troubleshooting
with alpine base image.
