main/dbus: add option to move machine-id
When /etc
is read-only dbus-uuidgen
can't generate a machine-id
there. To work around that a symlink to /run/machine-id
is possible. dbus-uuidgen
will not accept the symlink and try to overwrite it.
With this change dbus-uuidgen
can be told to generate the file at /run/machine-id
to get the symlink working properly.