Fix dependency installation for landscape install

First, we actually install cloud-install-landscape, and cloud-install-landscape
should really just depend on cloud-install-multi, since it calls all that code
directly.

Closes LP #1312794
Don't import precise images

...also don't import rc images, although I think these are no longer on
maas.ubuntu.com, so it probably doesn't matter :-)
juju-bootstrap should have perms to allow nested lxcs
Add a landscape specific make target

Also reorder something according to debian lintings.
Use templates/ instead of data/
don't ask when apt-get install -f'ing
work around LP 1288685
Eliminate some garbage writing to stdout

This was confusing the dialog stuff.