HEAD-1885: 'sdc-login NAME' improvements: only runing zones, lookup by alias
HEAD-1885: 'sdc-login NAME' improvements: only runing zones, lookup by alias

joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode