Put preventative wait into Contacts tests to wait for contacts lists 

Seeking prevention rather than a cure..

There are intermittent failures when the contacts app hasn't loaded the contact. I can't put this into the __init__ because sometimes we load without using the API to insert contacts so I made it explicit.

`master` -> tested, merge
`v1-train` -> testing now, will update status soon (edit: safe for `v1-train` too!)