watchquagga: Signal when we are actually up and running

When Quagga is starting up, it is returning immediately.
This is leaving us in a state where systemd believes
Quagga is up and running, while the sytem might actually
not have restarted the code yet.

Modify the code so that when watchquagga starts up
it doesn't start communicating with systemd until
such time that it detects that all daemons are
running.

Additionally modify watchquagga to touch a
file in /var/run/quagga/ that the /usr/lib/quagga/quagga
script looks for for 10 seconds.  If it finds this
Quagga started file then we know watchquagga
has successfully communicated with all daemons.
If after 10 seconds we haven't communicated
with Quagga, continue on for the start and let the
normal start failure code work.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

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