Refactor streaming retry conditions
Refactor streaming retry conditions

This is just cleanup before we tackle real issues around
StreamingEngine retry behavior.

Issue #960

Change-Id: I66bb80db9ee1fd469c0aa6c089313ba4ecf75101

tvoli/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,vimond/shaka-player,shaka-project/shaka-player,vimond/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player