unbound: fix hotplug iface and ntp restarts

unbound: fix hotplug iface and ntp restarts

Unbound is configured to restart on hotplug/iface but this can result
in numerous restarts at boot. Unbound also has a restart for NTP.
This was observed to generate trouble and even with procd robustness
too many crashes might occur (rare). Unbound would not be running.

Give more care to /var/lib/unbound/root.key during restarts. Use procd
for iface restarts. Check pidof() to wait one more second for Unbound.

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>