HEAD-2219: sdc-login: use 'sdcadm insts <filter>' support in recent sdcadm
HEAD-2219: sdc-login: use 'sdcadm insts <filter>' support in recent sdcadm

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