add ssh tooling

bin/executable_ssh-check-host-fingerprint

@@ -0,0 +1,17 @@
+#!/bin/sh
+tmpfile=$(mktemp /tmp/ssh-check-host-fingerprints.tmp.XXXXXX)
+ssh-keyscan -p "$2" "$1" 2>/dev/null > "$tmpfile"
+if [ -s "$tmpfile" ]; then
+	fingerprints=$(ssh-keygen -lf "$tmpfile" 2>/dev/null | awk '{print $2}')
+	for fingerprint in $fingerprints
+	do
+		if [ "$fingerprint" = "$3" ];
+		then
+			rm "$tmpfile"
+			exit 0
+		fi
+	done
+else
+	rm "$tmpfile"
+	exit 1
+fi