Fix bug in launch-instances subcommand of ami-publisher.
Fix bug in launch-instances subcommand of ami-publisher.

rgooch/Dominator,keep94/Dominator,keep94/Dominator,rgooch/Dominator,Symantec/Dominator,Symantec/Dominator,Symantec/Dominator,rgooch/Dominator,keep94/Dominator