Make run_all_tests more robust: use higher-level urllib2 with built-in timeout mechanism; retry when connection refused. 	Change on 2015/10/21 by johncox <johncox@google.com> ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=106017372
Make run_all_tests more robust: use higher-level urllib2 with built-in timeout mechanism; retry when connection refused.
	Change on 2015/10/21 by johncox <johncox@google.com>
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=106017372

andela-angene/coursebuilder-core,andela-angene/coursebuilder-core,andela-angene/coursebuilder-core,andela-angene/coursebuilder-core