- added ec2Flavour profile to create EC2 VMX disk image types along
  with this change the examples using format="ec2" were adapted to
  disk layout instead of flat (filesystem) layout too
- Fixed ec2 kernel profile for 13.1/13.2 and SLE11/12
  the required xen drivers were not added when using ec2 profile
  the xen package must not be installed when using ec2 profile