m/test: refactor cluster launch code, use for e2e tests

This is a light dust-off pass for the existing cluster launch code.
Notably, we separate Metropolis-specific code into a subpackage
(allowing us to make the package itself depend on the required
node/kernel images, without introducing dependency loops or unnecessary
dependencies on the Metropolis node image).

We also make the LaunchCluster code return an already authenticated
Management client, and subsequent changes will use this client to add
more nodes to the running cluster.

We then move the E2E test to use LaunchCluster instead of LaunchNode, in
preparation for running a multi-node cluster in the E2E test.

We also add some more log calls and clean up the existing ones to make
it clear which subsystem (launch, launch/cluster or e2e) is respondible
for each message.

Change-Id: I838bdc75073831fe94b9cdcef4fb3ab6bf8cba2c
Reviewed-on: https://review.monogon.dev/c/monogon/+/343
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/test/e2e/k8s_cts/BUILD.bazel b/metropolis/test/e2e/k8s_cts/BUILD.bazel
index e6e23de..2d8ac79 100644
--- a/metropolis/test/e2e/k8s_cts/BUILD.bazel
+++ b/metropolis/test/e2e/k8s_cts/BUILD.bazel
@@ -33,7 +33,7 @@
     deps = [
         "//metropolis/node:go_default_library",
         "//metropolis/test/e2e:go_default_library",
-        "//metropolis/test/launch:go_default_library",
+        "//metropolis/test/launch/cluster:go_default_library",
         "@io_k8s_api//core/v1:go_default_library",
         "@io_k8s_api//rbac/v1:go_default_library",
         "@io_k8s_apimachinery//pkg/apis/meta/v1:go_default_library",
@@ -42,14 +42,6 @@
 
 go_binary(
     name = "k8s_cts",
-    data = [
-        "//metropolis/node:image",
-        "//metropolis/node:swtpm_data",
-        "//metropolis/test/ktest:linux-testing",
-        "//metropolis/test/nanoswitch:initramfs",
-        "//third_party/edk2:firmware",
-        "@com_github_bonzini_qboot//:qboot-bin",
-    ],
     embed = [":go_default_library"],
     visibility = ["//visibility:private"],
 )
diff --git a/metropolis/test/e2e/k8s_cts/main.go b/metropolis/test/e2e/k8s_cts/main.go
index 026ca8a..46b99b4 100644
--- a/metropolis/test/e2e/k8s_cts/main.go
+++ b/metropolis/test/e2e/k8s_cts/main.go
@@ -35,7 +35,7 @@
 
 	common "source.monogon.dev/metropolis/node"
 	"source.monogon.dev/metropolis/test/e2e"
-	"source.monogon.dev/metropolis/test/launch"
+	"source.monogon.dev/metropolis/test/launch/cluster"
 )
 
 // makeCTSPodSpec generates a spec for a standalone pod running the Kubernetes
@@ -101,12 +101,12 @@
 	}()
 
 	// TODO(q3k): bump up number of nodes after multi-node workflow gets reimplemented.
-	debugClient, portMap, err := launch.LaunchCluster(ctx, launch.ClusterOptions{NumNodes: 1})
+	cl, err := cluster.LaunchCluster(ctx, cluster.ClusterOptions{NumNodes: 1})
 	if err != nil {
 		log.Fatalf("Failed to launch cluster: %v", err)
 	}
 	log.Println("Cluster initialized")
-	clientSet, err := e2e.GetKubeClientSet(ctx, debugClient, portMap[common.KubernetesAPIPort])
+	clientSet, err := e2e.GetKubeClientSet(ctx, cl.Debug, cl.Ports[common.KubernetesAPIPort])
 	if err != nil {
 		log.Fatalf("Failed to get clientSet: %v", err)
 	}