modified bootstrap so that oski user correctly created for ec2
modified bootstrap so that
oski user correctly created for ec2

linearregression/collaboratool,rdhyee/collaboratool,linearregression/collaboratool,dlab-berkeley/collaboratool,rdhyee/collaboratool,dlab-berkeley/collaboratool,dlab-berkeley/collaboratool,rdhyee/collaboratool,linearregression/collaboratool