metropolis/test/util: move in NewEphemeralClusterCredentials from rpc

Change-Id: I41603b19a76ea91c2191b0118183957973fc9ccd
Reviewed-on: https://review.monogon.dev/c/monogon/+/1960
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/util/BUILD.bazel b/metropolis/test/util/BUILD.bazel
index 16ed382..d431dbe 100644
--- a/metropolis/test/util/BUILD.bazel
+++ b/metropolis/test/util/BUILD.bazel
@@ -2,8 +2,15 @@
 
 go_library(
     name = "util",
-    srcs = ["runners.go"],
+    srcs = [
+        "rpc.go",
+        "runners.go",
+    ],
     importpath = "source.monogon.dev/metropolis/test/util",
     visibility = ["//metropolis:__subpackages__"],
-    deps = ["//metropolis/test/launch"],
+    deps = [
+        "//metropolis/node/core/identity",
+        "//metropolis/pkg/pki",
+        "//metropolis/test/launch",
+    ],
 )