* add first stepwise test env, Docker, with example transit test

* update transit stepwise test

* add other tests that use stepwise

* cleanup test, make names different than just 'transit'

* return the stderr if compile fails with error

* minor cleanups

* minor cleanups

* go mod vendor

* cleanups

* remove some extra code, and un-export some fields/methods

* update vendor

* remove reference to vault.CoreConfig, which really wasn't used anyway

* update with go mod vendor

* restore Precheck method to test cases

* clean up some networking things; create networks with UUID, clean up during teardown

* vendor stepwise

* Update sdk/testing/stepwise/environments/docker/environment.go

haha thanks :D
Co-authored-by: Michael Golowka <72365+pcman312@users.noreply.github.com>

* Update sdk/testing/stepwise/environments/docker/environment.go

Great catch, thanks

Co-authored-by: Michael Golowka <72365+pcman312@users.noreply.github.co...