### Why I did it
Remove UpdateGraphService feature from sonic image. The goal is to simplify the bootup process.
### How I did it
Remove updategraph service and updategraph script.
Update all related services, replace updategraph.service with config-setup.service.
#### How to verify it
Build and install new image, load minigraph and check all the services.
With this PR in, you flap BGP and use events_tool to see the published events.
With telemetry PR #111 in and corresponding submodule update done in buildimage, one could run gnmi_cli to capture BGP flap events.