Bug 576036: [headless] refactor earlyStartupBlacklist to extension pointChange-Id: I9756b958868dcf55c76f2f109fff28dcf1c8c599
Bug 576039: [headless] adapt script execution result to an integer before trying to parse a result, we should try to adapt it to an integer.Change-Id: Ibf5c63524b839709a20047bf669818d6757fd5ee