appliance: Add veewee definition for 64bit systemvm template

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
LICENSE: Fix attribution for 64bit template

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
appliance: Fix build.sh to build 64bit systemvm appliance as well

TODO: Make it general like boxer.sh in tools/devcloud/src

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>