[HVM-238] fix so HVM platforms get platform_type=hvm when importing.
[HVM-238] fix so HVM platforms get platform_type=hvm when importing.

joyent/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode