Add temperature-aware MD1200 fan control

das_fanctl.sh reads drive temps via smartctl (falling back to the EMM
backplane sensors), interpolates a fan percentage, and re-sends _shutup
on a 5s keepalive so the shelf does not revert to full speed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

get_das_temp.sh

@@ -0,0 +1,10 @@
+#/bin/bash
+
+#Zeb H.
+#Dell MD1200 Temperature Reading Script.
+
+#set TTY Flags
+stty -F /dev/ttyS1 38400 raw -echoe -echok -echoctl -echoke
+
+#Print temperature on screen
+echo -e -n '_temp_rd\r' > /dev/ttyS1