import fresh SP3 appliance from SUSE Studio

  https://susestudio.com/appliance/edit/1180710#/build
ensure build-custom succeeds
update READMEs
ignore kiwi output in kiwi/image/
fix image metadata
fix repo paths to hardcoded locations (for now)

Later I can adjust this so it works for other people.
add cloud_admin pattern
import nicer kiwi image building script

This comes from

  https://github.com/SUSE/cloud/blob/master/dev-setup/sles11-sp3/build-image.sh

and has some nice improvements from James Tan, including tmpfs support
and cleaner code.
fix self-description in build-image.sh
remove old author
remove EULA on first boot
autostart ntp and sshd
the RAM disk needs at least 5GB

... and that's without the software repositories embedded.
mention packer
fill out image-building instructions (WIP)
allow passing parameters to kiwi (e.g. --type)
switch to .vmdk for virtualbox
add vagrant public ssh key
setup sudoers
disable UseDNS in sshd