Add MCH control/logging scripts

mch_start

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+#!/bin/sh
+
+# Power on MCH
+python3 ~/power_strip/on.py
+
+# Get power-on time & date
+TIMESTAMP=$(date '+%Y%m%d%H%M%S')
+
+# Start `screen`ing Metlino and Saymas in detached mode and with logging
+sleep 1
+screen -dmS metlino -L -Logfile /home/pi/mlabs-testsuite/logs/metlino-$TIMESTAMP.log /dev/metlino 115200
+sleep 6
+screen -dmS sayma1amc -L -Logfile /home/pi/mlabs-testsuite/logs/sayma1-$TIMESTAMP-amc.log /dev/sayma1AMC 115200
+screen -dmS sayma1rtm -L -Logfile /home/pi/mlabs-testsuite/logs/sayma1-$TIMESTAMP-rtm.log /dev/sayma1RTM 115200
+screen -dmS sayma2amc -L -Logfile /home/pi/mlabs-testsuite/logs/sayma2-$TIMESTAMP-amc.log /dev/sayma2AMC 115200
+screen -dmS sayma2rtm -L -Logfile /home/pi/mlabs-testsuite/logs/sayma2-$TIMESTAMP-rtm.log /dev/sayma2RTM 115200
+echo "New logs has started."
+
+# This Shell script ends after spawning the `screen` sessions

mch_stop

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+#!/bin/sh
+
+# Quit all `screen` sessions for Metlino and Saymas
+screen -S metlino -X quit
+screen -S sayma1amc -X quit
+screen -S sayma1rtm -X quit
+screen -S sayma2amc -X quit
+screen -S sayma2rtm -X quit
+echo "All logging has stopped."
+
+# Power off MCH
+python3 ~/power_strip/off.py