[Merge] ~kajiya/livecd-rootfs:increase-image-size-questing into livecd-rootfs:ubuntu/master

[Chloé Smith]

The proposal to merge ~kajiya/livecd-rootfs:increase-image-size-questing into livecd-rootfs:ubuntu/master has been updated.

Description changed to:

Built a secret-sauce package with the recipe pointed here and got a successful GCE base questing build (relevant part of the build.log here: http://pastebin.ubuntu.com/p/7H7Fz66tSg/).

Downloads builds were also successful!

This fix has now been implemented in CPC's production `livecd-rootfs` (via our ~cloudware fork [0]) and is working there as well so this MP should be good to go.

[0]: https://code.launchpad.net/~cloudware/livecd-rootfs/+git/livecd-rootfs/+ref/questing

[EDIT] Since the new changes (19th Sept) I've rebuilt a GCE questing image successfully using this change in bartender, and am currently building a buildd image using the built livecd-rootfs pkg (https://launchpad.net/~cloudware/+archive/ubuntu/secret-sauce-kajiya/+packages?field.name_filter=&field.status_filter=published&field.series_filter=questing)

#### Logs 

Had to use pastebin.ubuntu.com instead of the internal one due to timeouts, hence the truncated GCP logs :)

Truncated GCP AMD64 build logs: https://pastebin.ubuntu.com/p/6GFZXwSC7D/

Full buildd AMD64 build logs: https://pastebin.ubuntu.com/p/FFJS7bTgmK/

Full Download-image ARM64 build logs: 

For more details, see:
https://code.launchpad.net/~kajiya/livecd-rootfs/+git/livecd-rootfs/+merge/488217
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