checksum doesn't make sense until we finalise the image

... and even then maybe not.
Disable VirtualBox USB2.0 controller

This should make it possible to use the box without having the Extension Pack
installed.
Merge pull request #1 from rhafer/no-extension

Disable VirtualBox USB2.0 controller
fix /etc/hosts
reduce tmpfs requirement now we are using -DEPS
explain why we still use SP3 and SP3-Updates
improve ordering of packages in config.xml
tmpfs requirements keep going up for some reason :-/
import fresh SP3 appliance from SUSE Studio

  https://susestudio.com/appliance/edit/1180710#/build

(cherry picked from commit c6ce82f53145468eb05040649d3fc6326ecc14ca)
fix image metadata

(cherry picked from commit 99b6392940c5292c6a4d46ecc56ab534900fa3ac)
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.

(cherry picked from commit 1bd8b02fcf058075a788617745d2814848e94d3f)
try to fix rm: cannot remove ‘/tmp/kiwi-build’: Device or resource busy

(cherry picked from commit 018e401fe297cab83072e95837da7dd0d16996bd)
only attempt to umount $TMP_DIR if it was tmpfs

(cherry picked from commit 053f1cf25af8d7bbcb083d4be7327ac0fe49fcac)
don't hide failure of rm -rf $TMP_DIR

(cherry picked from commit 5661b2d80d713c3f7fcaa00bf1cbceaaf0ef754b)
fix self-description in build-image.sh

(cherry picked from commit 92e479c2bd681eee9f86308066939907f77c0eb7)
only clean up if the build succeeded

(cherry picked from commit 39fd0374d31493e0953e8e82a66d4522b46d5ffa)
remove old author

(cherry picked from commit 3f7b8522c2c873c8fd23f5373a94fe95b9866627)
remove EULA on first boot

(cherry picked from commit dfa639f9f06bc51422dd2251131260be165ab3c5)
autostart ntp and sshd

(cherry picked from commit c556419761bdb3e4b7c3da1aef020f236ed86fdd)
the RAM disk needs at least 6.5GB

... and that's without the software repositories embedded.

(cherry picked from commit 91f9fafbaac7ecd94d22f05fba523991b4020d07)