Updated proto for concierge StartContainer call

This removes the async option, which is always used now. It also changes
the return response to deprecate the success bool field and instead use
an enum value for the return state.

BUG=None
TEST=Builds

Change-Id: Ib961a5db625d8921bdff80bd060ea847b39d5d56
Reviewed-on: https://chromium-review.googlesource.com/999961
Commit-Ready: Jeffrey Kardatzke <jkardatzke@google.com>
Tested-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
1 file changed