Merge pull request #112 from guedou/run_tests_binsh

Don't use /bin/bash in run_tests

test/run_tests

-#! /bin/bash
+#! /bin/sh
 DIR=$(dirname $0)/..
 if python --version 2>&1 | grep -q '^Python 2'; then
     PYTHON=python
 else
     PYTHON=python2
 fi
-if [ "$*" == "" ]
+if [ ! -n "$*" ]
 then
 PYTHONPATH=$DIR exec $PYTHON ${DIR}/scapy/tools/UTscapy.py -t regression.uts -f html -l -o /tmp/scapy_regression_test_$(date +%Y%m%d-%H%M%S).html
 else