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.

TEST=System boots up properly.

Change-Id: Ie078526d60b7c869f44e795d8a3c2f3073ddac0e
Reviewed-by: Gaurav Shah <>
Reviewed-by: Mattias Nissler <>
Commit-Queue: Mattias Nissler <>
Tested-by: Mattias Nissler <>
2 files changed