Stop http server after integration tests

tox.ini

@@ -43,6 +43,7 @@ whitelist_externals =
     bash
     sleep
     wget
+    fuser
 commands =
     tar -C {envtmpdir} -vxf {toxinidir}/tests/integration/net.tar
     bash {envtmpdir}/net/start.sh
@@ -52,6 +53,7 @@ commands =
     wget -O/dev/null http://127.0.0.1:28888/sbws.bin
     coverage run -a --rcfile={toxinidir}/.coveragerc --source=sbws -m pytest -s {toxinidir}/tests/integration -vv
     bash {envtmpdir}/net/stop.sh
+    fuser -k 28888/tcp
 
 [testenv:lint]
 skip_install = True