[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:LIVECD_ROOTFS_ROOT-fixes into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:LIVECD_ROOTFS_ROOT-fixes into livecd-rootfs:ubuntu/master.

Commit message:
fix: bake LIVECD_ROOTFS_ROOT into config/functions

Hooks that only source config/functions (not config/common) would fail
with "LIVECD_ROOTFS_ROOT: parameter not set" when calling setup_mountpoint
or any function that transitively calls it. This affected ubuntu, ubuntu-cpc,
and buildd hooks.

Rather than adding `. config/common` to every hook, prepend the
LIVECD_ROOTFS_ROOT assignment to config/functions at config time so it is
available to all callers automatically.



Requested reviews:
  Canonical Foundations Team (canonical-foundations)

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/502282
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