Replace logging with default logging interface (#233)

* Add test logger

* Refactor access manager logging

* Refactor activation service logging

* Refactor debugd logging

* Refactor kms server logging

* Refactor disk-mapper logging

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

internal/grpc/grpclog/grplog.go

@@ -0,0 +1,17 @@
+// grpclog provides a logging utilities for gRPC.
+package grpclog
+
+import (
+	"context"
+
+	"google.golang.org/grpc/peer"
+)
+
+// PeerAddrFromContext returns a peer's address from context, or "unknown" if not found.
+func PeerAddrFromContext(ctx context.Context) string {
+	p, ok := peer.FromContext(ctx)
+	if !ok {
+		return "unknown"
+	}
+	return p.Addr.String()
+}