[#NETVIRT-1257] Update packer images to include downloaded artifacts

devstack downloads/wgets some artifacts during stacking. Sometimes those downloads fail and the stack aborts. An example is below where the cirros images are downloaded.

2018-05-15 08:55:10.791 | + functions:upload_image:98                :   wget --progress=dot:giga -c http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img -O /opt/stack/devstack/files/cirros-0.3.5-x86_64-disk.img
2018-05-15 08:55:10.794 | --2018-05-15 08:55:10--  http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img
2018-05-15 08:55:10.808 | Resolving download.cirros-cloud.net (download.cirros-cloud.net)... failed: Name or service not known.
2018-05-15 08:55:10.808 | wget: unable to resolve host address â€˜download.cirros-cloud.netâ€™
2018-05-15 08:55:10.810 | + functions:upload_image:1                 :   exit_trap

NetVirt CSIT Improvements (NETVIRT-1086) [NETVIRT-1257] Update packer images to include downloaded artifacts Created: 15/May/18 Updated: 27/Nov/19
Status:	Open
Project:	netvirt
Component/s:	None
Affects Version/s:	None
Fix Version/s:	None

[NETVIRT-1257] Update packer images to include downloaded artifacts Created: 15/May/18 Updated: 27/Nov/19