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/install.go b/cloud/agent/install.go
index 126d365..6082337 100644
--- a/cloud/agent/install.go
+++ b/cloud/agent/install.go
@@ -15,10 +15,10 @@
 
 	bpb "source.monogon.dev/cloud/bmaas/server/api"
 	"source.monogon.dev/metropolis/node/build/mkimage/osimage"
-	"source.monogon.dev/metropolis/pkg/blockdev"
-	"source.monogon.dev/metropolis/pkg/efivarfs"
-	"source.monogon.dev/metropolis/pkg/logtree"
 	npb "source.monogon.dev/net/proto"
+	"source.monogon.dev/osbase/blockdev"
+	"source.monogon.dev/osbase/efivarfs"
+	"source.monogon.dev/osbase/logtree"
 )
 
 //go:embed metropolis/node/core/abloader/abloader_bin.efi