Re: [PATCH v5 2/2] Introduce kdump capture service

This patch introduce a new kdump-capture.service which is used to run kdump.sh. kdump-capture.service has OnFailure=emergency.target and OnFailureIsolate=yes set. When kdump.sh fails, the kdump emergency service will be triggered and enter the error handling path. In 2nd kernel, the default target for systemd is initrd.target, so we put kdump-capture.service in initrd.target.wants/ and by that, system will start kdump-capture as part of the boot process. kdump.sh used to run in dracut-pre-pivot hook. Now kdump-capture.service is placed after dracut-pre-pivot.service and other dependencies are all copied from dracut-pre-pivot.service. So the start point of kdump.sh will be almost the same as it used to be.