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

Merge pull request rancher#429 from dweomer/xorriso-joliet-bootable-f…

…rom-usb

iso: fix usb image

Merge pull request rancher#429 from dweomer/xorriso-joliet-bootable-f…

…rom-usb

iso: fix usb image

Merge pull request rancher#428 from dweomer/base/tzdata

base: add tzdata and ncurses-terminfo

Merge pull request rancher#412 from dweomer/k3s/v1.17.4+k3s1

k3s v1.17.4+k3s1

Merge pull request rancher#388 from dweomer/bump/system-upgrade-contr…

…oller/v0.3.1

bump system-upgrade-controller to v0.3.1

Merge pull request rancher#375 from dweomer/pre-v0.9.0

doc cleanup prior to release