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/metrics/discovery.go b/metropolis/node/core/metrics/discovery.go
index ff3fcf1..116291e 100644
--- a/metropolis/node/core/metrics/discovery.go
+++ b/metropolis/node/core/metrics/discovery.go
@@ -9,7 +9,7 @@
 
 	"source.monogon.dev/go/types/mapsets"
 	"source.monogon.dev/metropolis/node/core/curator/watcher"
-	"source.monogon.dev/metropolis/pkg/supervisor"
+	"source.monogon.dev/osbase/supervisor"
 
 	ipb "source.monogon.dev/metropolis/node/core/curator/proto/api"
 )