Wait to fire start event until socket is created
Wait to fire start event until socket is created

Previously, this check only worked if no host was specified and was
hard coded to check for "/var/run/docker.sock"

This change generalizes that check and captures any specified socket
and waits for it to be created.

Caveat: This will only check the first socket specified, but it is an
improvement over none at all.

Fixes #185160

Signed-off-by: Andrew Guenther <8df9db1b3435e131e7d9181383120903663c4c38@gmail.com>

aditirajagopal/docker,aditirajagopal/docker,aditirajagopal/docker