conpaas frontend installation script: group credentials-related options together. Add a note for security group/keypair
conpaas frontend installation script: group credentials-related options together. Add a note for security group/keypair

ConPaaS-team/conpaas,ConPaaS-team/conpaas,ConPaaS-team/conpaas,ConPaaS-team/conpaas,ConPaaS-team/conpaas,ConPaaS-team/conpaas,ConPaaS-team/conpaas