Made required arguments actually required for "all", "rolling" and "instances" commands
Made required arguments actually required for "all", "rolling" and "instances" commands

smartpcr/reinvent2014-scalable-site-management,0xdco/reinvent2014-scalable-site-management,smartpcr/reinvent2014-scalable-site-management,0xdco/reinvent2014-scalable-site-management,awslabs/reinvent2014-scalable-site-management,awslabs/reinvent2014-scalable-site-management,smartpcr/reinvent2014-scalable-site-management,0xdco/reinvent2014-scalable-site-management,awslabs/reinvent2014-scalable-site-management