mount from bare usb device if mount fails

If mounting the discovered USB device fails during install, try again mounting the bare device, i.e. /dev/sdb3 -> /dev/sdb.

mount from bare usb device if mount fails

If mounting the discovered USB device fails during install, try again mounting the bare device, i.e. /dev/sdb3 -> /dev/sdb.

run grub-install with `--removable` to install grub efi binary to efi…

… fallback location

this fixes booting in bhyve but should be tested on other platforms!

Links:
- https://wiki.archlinux.org/index.php/GRUB#Default/fallback_boot_path
- https://www.jongibbins.com/solving-uefi-boot-problems-on-bhyve-freenas-vm/

install: fix previous menuentry (rancher#526)

Also add rescue options for both previous and current.

kernel: 5.4.0-37.41 (rancher#524)

Addresses rancher#478
Addresses rancher#483

k3s: v1.17.7+k3s1 (rancher#522)

cloud-config: bump linux metadata (rancher#467)

Pick up support for digital ocean and cdrom-by-label.

Merge pull request rancher#505 from dweomer/k3s/v1.17.6+k3s1

k3s: v1.17.6+k3s1

Merge pull request rancher#460 from dweomer/bump/k3s/v1.17.5+k3s1

k3s: bump to v1.17.5+k3s1

Merge pull request rancher#460 from dweomer/bump/k3s/v1.17.5+k3s1

k3s: bump to v1.17.5+k3s1