Add net.ipv6.conf.all.forwarding=1 sysctl
Merge pull request #66 from jordant/linux

Linux raw build script
Change default password for applaince to "akanda"
Update MOTD to include default root password
Merge pull request #68 from jordant/linux

Update default root password / MOTD
Change APPLIANCE_BASE_DIR to more generic /tmp/akanda-appliance and only
setup ssh key if $APPLIANCE_SCRIPT_DIR/etc/key exists
Keep python-pip installed after the build is complete and no longer remove
dhcp-client after build is done
Remove dad_count/dad_transmists from sysctl
Do not remove ssh keys here. This should be done at the end of your image build
process
Merge pull request #69 from jordant/linux

Various changes to create-akanda-raw-image.sh
Update `ifconfig` parsing to support Linux format.
More `ifconfig` BSD -> Linux changes.
Ignore link-local addresses for `ifconfig` management.