docs(*): add DigitalOcean in a few places it was left out
docs(*): remove Rackspace support

Rackspace cannot be supported until it updates its images regularly.
Merge pull request #1364 from deis/rackspace_warning

docs(*): remove support for Rackspace
chore(tests): update etcd versions in test-etcd Dockerfile
fix(Makefile): ignore status of data services in `make start`

The fleet status-matching regexes in the main Makefile didn't take
into account the addition of *-data.service jobs, and were therefore
reporting on both the status of deis-registry.service and
deis-registry-data.service. This PR appends a dot to each regex to
avoid matching the *-data.services.
fix(systemd units): Fix docker containers being orphaned

Docker seems to orphan our containers after the fix in 6b452e,
this reverts part of it and properly signals the docker containers to
stop. Given that we run them with `--rm`, this also makes the ephemeral
containers destroy their data off of the drives. The data containers are
not affected by this and they persist.
Merge pull request #1381 from deis/fix/gh-1378/orphaned-containers

fix(systemd units): Fix docker containers being orphaned
Merge pull request #1371 from deis/makefile-status-fix

fix(Makefile): ignore status of data services in `make start`
Merge pull request #1368 from deis/update-test-etcd

chore(tests): update etcd versions in test-etcd Dockerfile
refactor(tests): remove unneeded `docker history` checks
refactor(tests): remove unneeded sleep and sync code
fix(tests): remove unneeded logging from ClearTestSession()
Merge pull request #1370 from deis/component-test-fixes

refactor(tests): simplify docker functional tests
fix(router): bump read timeout to 10min for docker build
feat(client): add deis build support
feat(controller): add deis build support
feat(builder): add deis build support
fix(router): update send_timeout from rebase error
chore(registry): bump version to repository-import

The endpoint introduced in this branch is important as it allows registry-to-registry
repository transfers. This is required to speed up the `deis build` process and to remove
the docker engine from the controller.
fix(controller): remove docker engine

The intention of the docker engine was such that we could use it to pull in an image
from a registry and push it to our own. Now that we have registry transfers, this
is no longer required.