Milo: Handle missing / transient LogDog failures.

logdog/common/types/streamaddr.go

Index: logdog/common/types/streamaddr.go
diff --git a/logdog/common/types/streamaddr.go b/logdog/common/types/streamaddr.go
index a3e703e5bae4a2b87d115d29933954bfe7e99733..53d1018e4ee2f6f1f6fc59512a1aebdb32b70039 100644
--- a/logdog/common/types/streamaddr.go
+++ b/logdog/common/types/streamaddr.go
@@ -26,6 +26,9 @@ type StreamAddr struct {
 	Path StreamPath
 }
 
+// String returns a string representation of this address.
+func (s *StreamAddr) String() string { return s.URL().String() }
+
 // URL returns a LogDog URL that represents this Stream.
 func (s *StreamAddr) URL() *url.URL {
 	return &url.URL{