chore(tests): update etcd versions in test-etcd Dockerfile
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(confd): simplify check_cmd and fix grep usage