Move sd notify ready - fixes #391

[CarlFK]

tests pass and seems to be OK on my test box.

[CarlFK]

sudo systemctl status videoteam-voctocore.service

Apr 29 11:42:26 gator voctocore.py[2450]:     INFO Voctocore: Running. Waiting for connections....
Apr 29 11:42:26 gator voctocore.py[2450]:     INFO Scene: Pushing 1 frame(s) to source 'cam1' at time 17ms
Apr 29 11:42:26 gator voctocore.py[2450]:     INFO Scene: Pushing 1 frame(s) to source 'slides' at time 17ms
Apr 29 11:42:26 gator voctocore.py[2450]:     INFO Pipeline:
Apr 29 11:42:26 gator voctocore.py[2450]: ====================== UP AND RUNNING =====================
Apr 29 11:42:26 gator voctocore.py[2450]:     INFO SystemdNotify: READY=1

[CarlFK]

Opps, my "wrapps v4l2src in fallbacksrc" change is in here too.

[CarlFK]

fallbacksrc commit removed from this PR.

sd_notify change is ready for merge