Add sample material for nodeconsole automation for MOK manipulation

misc/secureboot/deletemok.nca

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+expect Press any key to perform MOK management
+send a
+expect Delete MOK
+send <down><enter>
+expect Continue
+send <down><enter>
+expect Yes
+send <down><enter>
+expect Password:
+send <env:MOKPASS><enter>
+expect Reboot
+send <enter>
+exit

misc/secureboot/enrollmok.nca

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+expect Press any key to perform MOK management
+send a
+expect Enroll MOK
+send <down><enter>
+expect Continue
+send <down><enter>
+expect Yes
+send <down><enter>
+expect Password:
+send <env:MOKPASS><enter>
+expect Reboot
+send <enter>
+exit

misc/secureboot/purgemok.sh

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+#!/bin/bash
+if [ -z "$MOKPASS" ]; then
+	echo "MOKPASS must be set to proceed"
+	exit 1
+fi
+set -euo pipefail
+node=$2
+file=$1
+nodersync $file $node:/tmp/
+ssh $node mokutil --delete /tmp/$file --root-pw
+ssh $node reboot
+nodeconsole $node -ea deletemok.nca

misc/secureboot/pushmok.sh

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+#!/bin/bash
+if [ -z "$MOKPASS" ]; then
+	echo "MOKPASS must be set to proceed"
+	exit 1
+fi
+set -euo pipefail
+node=$2
+file=$1
+nodersync $file $node:/tmp/
+ssh $node mokutil --import /tmp/$file --root-pw
+ssh $node reboot
+nodeconsole $node -ea enrollmok.nca