drop number from cloud3-admin/ subdirectories

This will allow us to branch for Cloud 4 and then have two different
branches which are easily comparable.

However, the generated box will still have the product release number in
its name and hostname, in order to clearly distinguish between boxes
corresponding to different product releases.
Merge pull request #5 from aspiers/drop-rel-number

drop number from cloud3-admin/ subdirectories
fix a path which was missed by 0abd0f4a
drop product version number where we don't need it

This will reduce the number of search and replace occurrences for the
future.
clarify NAT requirement is for VirtualBox provider only
-DEPS iso got renamed to be shared between Cloud 3, 4, and 5
add libvirt settings
make network configuration specific per-provider
add warnings about bnc#895204

https://bugzilla.novell.com/show_bug.cgi?id=895204
remove unnecessary enabling of nested virtualization

This is only needed for compute nodes.
switch from Cloud 3 to Cloud 4
move and rename vagrant-libvirt management network
drop a whole load of patches which have been merged into Cloud 4
make indentation of heredoc consistent with rest of file
crowbar_register --no-gpg-checks

crowbar_register accepts a new option --no-gpg-checks in Cloud 4.
We need it here because we're using unsigned media.
for now, inject CLOUD and DEPS isos from host
add missing set -e to provisioner scripts
ensure cloud_admin pattern is fully installed

otherwise the check in install-suse-cloud will fail.
work around https://bugzilla.novell.com/show_bug.cgi?id=895417
forward port 3000 specifically to 192.168.124.10

Probably not essential, but a bit cleaner.