Add python 3 executables

test/run_tests3

+#! /bin/sh
+DIR=$(dirname $0)/..
+PYTHON=python3
+if [ -z "$*" ]
+then
+    PYTHONPATH=$DIR exec $PYTHON ${DIR}/scapy/tools/UTscapy.py -t regression.uts -f html -K ipv6 -l -o /tmp/scapy_regression_test_$(date +%Y%m%d-%H%M%S).html
+else
+    PYTHONPATH=$DIR exec $PYTHON ${DIR}/scapy/tools/UTscapy.py "$@"
+fi