[keepalive] Update state properly.
[keepalive] Update state properly.

If keepalive is started after sinks or sources are
already created make sure the bookkeeping is correct.

mer-hybris/pulseaudio-modules-droid,jusa/pulseaudio-modules-droid,mer-hybris/pulseaudio-modules-droid,jusa/pulseaudio-modules-droid