Guarantee udev processing is complete on started system-services Change udev-trigger to be a task job so it needs to complete before the started event for system-services gets emitted. Update documentation in system-services to call this out. BUG=chromium:358213 TEST=System boots up properly. Change-Id: Ie078526d60b7c869f44e795d8a3c2f3073ddac0e Reviewed-on: https://chromium-review.googlesource.com/198000 Reviewed-by: Gaurav Shah <[email protected]> Reviewed-by: Mattias Nissler <[email protected]> Commit-Queue: Mattias Nissler <[email protected]> Tested-by: Mattias Nissler <[email protected]>