fix(controller): tack on host/port to image id

With the changes to how we store images in the controller, we stripped
the host/port from the image. We must add it back if we want to pull
it from the registry.
Merge pull request #1517 from deis/hotfix-apps-run

fix(controller): tack on host/port to image id
tests(integration): add check for systemd unit file droppings
tests(integration): document regression test for `clusters:update --auth=`

We already had a regression test to ensure the deis CLI wasn't just
sending the key path when updating the cluster. This change makes that
clearer and clarifies the output of the `CheckList()` test function.
fix(builder): bump timeout to 30m

The builer component times out not infrequently because it pulls
deis/slugrunner and deis/slugbuilder. Sometimes, if the Docker Hub
is slow, it takes several tries to get this running. Bumping the
timeout isn't a solution, but it is hopefully a stopgap.
Merge pull request #1523 from deis/test-regression-unitfile-removal

tests(integration): add check for systemd unit file droppings
Merge pull request #1524 from deis/bump_builder_timeout

fix(builder): bump timeout to 30m
Merge pull request #1525 from deis/test-regression-auth-update

tests(integration): document regression test for `clusters:update --auth=`