fix(controller/registry): add old config vars

In child images, we weren't dumping the old config variables from
previous images. This would fester and would run into issues such as
environment variables going missing. Adding them back solves this issue.
Merge pull request #1336 from deis/1326-container-config

fix(controller/registry): add old config vars
docs(*): add back references to DigitalOcean support
chore(coreos): upgrade to 379.3.0

This also bumps Docker to 1.1.1.

Note that this also changes the device names for EC2
and DigitalOcean, as CoreOS changed these as of 379.0.0.
Merge pull request #1352 from deis/add_do_to_docs

docs(*): add back references to DigitalOcean support
fix(tests): close socket listener in GetRandomPort()
fix(tests): build docker image as first test step

This keeps us from starting etcd and other test support services
minutes before they are needed, and makes the component tests
fail faster when there are build errors, which is not uncommon.
feat(tests): only pull deis/test-etcd if it is missing
feat(tests): only pull test-postgresql if it is missing
fix(registry/tests): recreate venv and clean up temp dir
Merge pull request #1351 from deis/fix-component-tests

fix(tests): component test improvements
Merge pull request #1345 from deis/coreos-379.3.0

chore(coreos): upgrade to 379.3.0 and Docker 1.1.1
docs(installing): fix up ReST syntax
docs(installing): add section on installing SSL

This section explains and describes how you can install an SSL certificate onto your load
balancer for SSL encryption between the client and the server, as well as the
applications themselves.

Note that this commit is dependent upon #1010 to be merged before SSL encryption works with Deis.
docs(ssl): add links for EC2/Rackspace ELBs
Merge pull request #1184 from deis/ssl-docs

docs(installing) add section on installing SSL
fix(controller): restart celery or gunicorn in reload script

Previously the /app/bin/reload script invoked by confd assumed that
pidfiles for celery and gunicorn always exist, which is not true in
some failure cases. This only sends them a SIGHUP if they are running,
and restarts them otherwise.

Fixes #1100.