PORTAL-173: rm -20 from kill, should fix shutdown times.
PORTAL-173: rm -20 from kill, should fix shutdown times.

The "-20" is SIGWINCH subtleness copied accidentally from the
provisioner agent's SMF manifest. The provisioner has custom signal
handling code to watch for SIGWINCH for that. Not so the portal node
code.

Also, "duration=child" property consider harmful change. See related
changes in other smartdc services.

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