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/proto/common/common.proto b/metropolis/proto/common/common.proto
index a0e8c73..758631f 100644
--- a/metropolis/proto/common/common.proto
+++ b/metropolis/proto/common/common.proto
@@ -21,7 +21,7 @@
 import "google/protobuf/timestamp.proto";
 import "version/spec/spec.proto";
 
-import "metropolis/pkg/logtree/proto/logtree.proto";
+import "osbase/logtree/proto/logtree.proto";
 
 // NodeRoles are the possible roles that a Metropolis Node should run within the
 // cluster. These are configured by the cluster and can be retrieved through the
@@ -252,7 +252,7 @@
     // If leveled logs are returned, all entries at severity lower than `minimum`
     // will be discarded.
     message LeveledWithMinimumSeverity {
-        metropolis.pkg.logtree.proto.LeveledLogSeverity minimum = 1;
+        osbase.pkg.logtree.proto.LeveledLogSeverity minimum = 1;
     }
     oneof filter {
         WithChildren with_children = 1;