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/go/net/tinylb/BUILD.bazel b/go/net/tinylb/BUILD.bazel
index a238bd3..ac65693 100644
--- a/go/net/tinylb/BUILD.bazel
+++ b/go/net/tinylb/BUILD.bazel
@@ -10,8 +10,8 @@
     visibility = ["//visibility:public"],
     deps = [
         "//go/types/mapsets",
-        "//metropolis/pkg/event",
-        "//metropolis/pkg/supervisor",
+        "//osbase/event",
+        "//osbase/supervisor",
     ],
 )
 
@@ -20,7 +20,7 @@
     srcs = ["tinylb_test.go"],
     embed = [":tinylb"],
     deps = [
-        "//metropolis/pkg/event/memory",
-        "//metropolis/pkg/supervisor",
+        "//osbase/event/memory",
+        "//osbase/supervisor",
     ],
 )