treewide: introduce osbase package and move things around

All except localregistry moved from metropolis/pkg to osbase,
localregistry moved to metropolis/test as its only used there anyway.

Change-Id: If1a4bf377364bef0ac23169e1b90379c71b06d72
Reviewed-on: https://review.monogon.dev/c/monogon/+/3079
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/metropolis/node/core/rpc/BUILD.bazel b/metropolis/node/core/rpc/BUILD.bazel
index bdddb1e..b1b4bfc 100644
--- a/metropolis/node/core/rpc/BUILD.bazel
+++ b/metropolis/node/core/rpc/BUILD.bazel
@@ -14,9 +14,9 @@
     visibility = ["//visibility:public"],
     deps = [
         "//metropolis/node/core/identity",
-        "//metropolis/pkg/logtree",
         "//metropolis/proto/api",
         "//metropolis/proto/ext",
+        "//osbase/logtree",
         "@org_golang_google_grpc//:go_default_library",
         "@org_golang_google_grpc//codes",
         "@org_golang_google_grpc//credentials",
@@ -38,10 +38,10 @@
     embed = [":rpc"],
     deps = [
         "//metropolis/node/core/curator/proto/api",
-        "//metropolis/pkg/logtree",
         "//metropolis/proto/api",
         "//metropolis/proto/ext",
         "//metropolis/test/util",
+        "//osbase/logtree",
         "@org_golang_google_grpc//:go_default_library",
         "@org_golang_google_grpc//codes",
         "@org_golang_google_grpc//status",