Stepwise docker env (#9292)

* 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.com>

* fix redundant name

* update error message in test

* Update builtin/credential/userpass/stepwise_test.go

More explicit error checking and responding

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

* Update builtin/logical/aws/stepwise_test.go

`test` -> `testFunc`

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

* Update builtin/logical/transit/stepwise_test.go

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

* fix typos

* update error messages to provide clarity

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

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

* update error handling / collection in Teardown

* panic if GenerateUUID returns an error

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

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

* Update builtin/credential/userpass/stepwise_test.go

Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>

* Update builtin/logical/aws/stepwise_test.go

Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>

* Update builtin/logical/transit/stepwise_test.go

Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>

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

Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>

* import ordering

* standardize on dc from rc for cluster

* lowercase name

* CreateAPIClient -> NewAPIClient

* testWait -> ensure

* go mod cleanup

* cleanups

* move fields and method around

* make start and dockerclusternode private; use better random serial number

* use better random for SerialNumber

* add a timeout to the context used for terminating the docker container

* Use a constant for the Docker client version

* rearrange import statements

Co-authored-by: Michael Golowka <72365+pcman312@users.noreply.github.com>
Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>

vendor/github.com/containerd/continuity/syscallx/syscall_unix.go

@@ -0,0 +1,26 @@
+// +build !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package syscallx
+
+import "syscall"
+
+// Readlink returns the destination of the named symbolic link.
+func Readlink(path string, buf []byte) (n int, err error) {
+	return syscall.Readlink(path, buf)
+}