tests: add pytest section and put tox and tests/scripts to norecursedirs

kallithea/tests/scripts are non-integrated messy tests
that cant be part of a testsuite as is

tox.ini

@@ -1,3 +1,7 b''
+[pytest]
+norecursedirs = kallithea/tests/scripts .tox
+
+
 [tox]
 envlist = py{26,27}-{pytest,nose}