Use setup.py to run tests

test/lib/__init__.py

-import sys
-import os
-import getopt
-
-root = os.path.join(os.path.abspath(os.path.dirname(__file__)), '../..')
-
-# look for modules in the CWD, then gajim/test/lib, then gajim/src,
-# then everywhere else
-sys.path.insert(1, root)
-sys.path.insert(1, root + '/test/lib')
-
 def xml2str_sorted(data):
     s = "<" + data.name
     if data.namespace:
@@ -38,5 +27,3 @@ def xml2str_sorted(data):
         s += "</" + data.name + ">"
     return s
 
-def setup_env():
-    pass