Include basic unit test run

  Now people can easily add tests

setup.py

@@ -88,4 +88,5 @@ setup(name=name,
           'networkbench = slapos.networkbench:main'
         ]
       },
+      test_suite='slapos.test',
     )

slapos/test/test_systool.py

+
+import unittest
+from slapos.systool import sublist
+
+class TestSystool(unittest.TestCase):
+  def test_sublist(self):
+    assert sublist("ab", "b")
+    assert sublist("ac", "b") == False
+
+
+if __name__ == '__main__':
+  unittest.main()