Reduce level of noise in debug logs from containers dying

ipam/allocator.go

@@ -214,8 +214,11 @@ func (alloc *Allocator) Claim(ident string, addr address.Address, cancelChan <-c
 
 // ContainerDied is provided to satisfy the updater interface; does a 'Delete' underneath.  Sync.
 func (alloc *Allocator) ContainerDied(ident string) error {
-	alloc.debugln("Container", ident, "died; releasing addresses")
-	return alloc.Delete(ident)
+	err := alloc.Delete(ident)
+	if err == nil {
+		alloc.debugln("Container", ident, "died; released addresses")
+	}
+	return err
 }
 
 // Delete (Sync) - release all IP addresses for container with given name