buildenv.sh: fix lxc_run

We can't use lxc-attach for running remote commands (see
https://help.ubuntu.com/lts/serverguide/lxc.html). Instead, we can just
use remote commands via ssh.
buildenv.sh: fix lxc_scp scp arg quotation
buildenv.sh: call get_ip

get_ip should be called if this script is executed or sourced.
zerovm-cli: fix misc bugs in zerovm-cli scripts

There were a bunch of errors, including copy/paste errors and arg
quotation errors.