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/cloud/agent/agent.go b/cloud/agent/agent.go
index 8efafd0..e014ac0 100644
--- a/cloud/agent/agent.go
+++ b/cloud/agent/agent.go
@@ -22,8 +22,8 @@
 	bpb "source.monogon.dev/cloud/bmaas/server/api"
 	"source.monogon.dev/metropolis/node/core/devmgr"
 	"source.monogon.dev/metropolis/node/core/network"
-	"source.monogon.dev/metropolis/pkg/pki"
-	"source.monogon.dev/metropolis/pkg/supervisor"
+	"source.monogon.dev/osbase/pki"
+	"source.monogon.dev/osbase/supervisor"
 )
 
 // This is similar to rpc.NewEphemeralCredentials, but that only deals with