Fixes#2957
- replace `docker stop` with `weaveuitl stop-container`
- replace `docker kill` with `weaveutil kill-container`
- replace `docker rm` with `weaveutil remove-container`
- replace `docker run` with minimal `weaveutil container-run`
- replace `docker inspect -f {{.ID}}` with `weaveutil container-id`
- replace data-only container `docker create` with `weaveutil create-volume-container`
- remove `docker inspect` dependencies from `weave` script
`rewrite_etc_hosts` and `with_container_fqdn`
- rework `weave` script `check_running` and `check_not_running` to use `weaveutil`
- rework `weave version` to use `weaver` /report API or `weaver --version` if not running
- rework `weave setup`'s `docker pull` to run locally rather than in `weaveexec` container
When running in the AWSVPC mode, we need to do the following:
- Keep the HW TX offloading on.
- Check that the allocated address belongs to the default subnet,
because only one subnet is allowed and it should be the default one.
If it is not possible to determine whether AWSVPC is on, we ignore
all the steps, because the attachment routines have to work
regardless whether the router is running and the AWSVPC detection
is done by querying the /ipinfo/tracker endpoint served by
the router.
David Shepherd