Merge pull request #9 from larsbutler/fix-pr-checkouts

Fix pull request checkouts
Merge pull request #10 from larsbutler/validator-use-autotools

Validator: use autotools
buildenv.sh: remove use of lxc-attach

`lxc-attach` is not supported on our deployment platform (Ubuntu 12.04).
See https://help.ubuntu.com/lts/serverguide/lxc.html.
zerovm-cli: remove some redundant calls to get_ip