osbase/logtree.LeveledLogger -> go/logging.Leveled

This factors out the common leveled logger interface out of the logtree.
We want to use the same interface outside of logtree/supervisor usage
within the resolver code, which will be exposed to clients.

Change-Id: I299e76d91e8cefddf8f36f1e58432418c4694df2
Reviewed-on: https://review.monogon.dev/c/monogon/+/3411
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/cloud/agent/install.go b/cloud/agent/install.go
index 29641bd..932cff8 100644
--- a/cloud/agent/install.go
+++ b/cloud/agent/install.go
@@ -15,10 +15,10 @@
 	"google.golang.org/protobuf/proto"
 
 	bpb "source.monogon.dev/cloud/bmaas/server/api"
+	"source.monogon.dev/go/logging"
 	"source.monogon.dev/osbase/blockdev"
 	"source.monogon.dev/osbase/build/mkimage/osimage"
 	"source.monogon.dev/osbase/efivarfs"
-	"source.monogon.dev/osbase/logtree"
 	npb "source.monogon.dev/osbase/net/proto"
 )
 
@@ -42,7 +42,7 @@
 
 // install dispatches OSInstallationRequests to the appropriate installer
 // method
-func install(req *bpb.OSInstallationRequest, netConfig *npb.Net, l logtree.LeveledLogger) error {
+func install(req *bpb.OSInstallationRequest, netConfig *npb.Net, l logging.Leveled) error {
 	switch reqT := req.Type.(type) {
 	case *bpb.OSInstallationRequest_Metropolis:
 		return installMetropolis(reqT.Metropolis, netConfig, l)
@@ -51,7 +51,7 @@
 	}
 }
 
-func installMetropolis(req *bpb.MetropolisInstallationRequest, netConfig *npb.Net, l logtree.LeveledLogger) error {
+func installMetropolis(req *bpb.MetropolisInstallationRequest, netConfig *npb.Net, l logging.Leveled) error {
 	// Validate we are running via EFI.
 	if _, err := os.Stat("/sys/firmware/efi"); os.IsNotExist(err) {
 		//nolint:ST1005