Default kernel command line doesn't work with swapfiles

[Mario Limonciello]

Currently hibernating doesn't work in the out of box configuration of Ubuntu which creates a swapfile by default.

Swapfiles are less discoverable than swap partitions from the perspective of initramfs-tools and the kernel.

To use them the following kernel command line options are needed:
resume=
resume_offset=

Resume represents the device that will be resumed from that contains the swapfile.
Resume offset represents the location in the disk that the swapfile is located.

Attached is a patch that will populate these two options as necessary

[Mario Limonciello (superm1)]

Marking this as a duplicate of bug 1760106 as it's really the better way to do this than add more parameters into everyone's default kernel command line.