* More robust smoke test script

- Keep going on a failure and only error out at the end.
- Use registry v2 in docker-compose.yml.
- Use unique compose project names to prevent clobbering.

* Revert "Remove test compose setup by default"

This reverts commit cb92194,
which appears to have been a thinko. "$NOKILL" == "0" was correct:
if NOKILL is not set, it's set to "0" on line 3, and so the cleanup
is indeed carried out by default.

* Remove port mapping for smoke tests

This mapping is not used in tests and may cause them to fail if
that global resource is held by something else.

* Use registry.tld in example compose file

This added text is a request from Puppet that we clarify our support arrangement. Jody Hunt asked for this.

* Support Conjur v5 API

* Smoke tests for Conjur v5

Note they replace the tests for Conjur v4. Further work is required
to merge them back (or alternatively they can be put in a separate
directory, but that would lead to code duplication).

* Lint it up

* Use latest docker tag for Conjur image

* Use correct network name in smoke tests

* README adjustments for clarification of the version option

* Fix a code typo

* Add back the Conjur v4 smoke tests

* Jenkins parallel tests, take two

* Use different compose project name for v4 tests

* Correct the paths in ee smoke test script