Timeouts and retries for OSS installation commands

Reviewed By: @JoelMarcey

Differential Revision: D1392350
Clownlist more flakey joomla tests

Reviewed By: @JoelMarcey

Differential Revision: D1392685
Clownlist another phpbb3 test

Summary: thisisclowntown

Reviewed By: @JoelMarcey

Differential Revision: D1392742