VoicemailContract API change to add voicemail status table fields.

See design doc:
https://docs.google.com/a/google.com/document/pub?id=1FM2cl7Qqt002m9PahbpxUAJNM8rdH1b08IHePi-qaDA

Change-Id: Ib471f50d32ed77eed45a4e0857e3053be8a6582d
1 file changed