remove useless rpdb dependency.

setup.py

@@ -42,7 +42,7 @@ setup(name=name,
         'slapos.core', # as it provides library for slap
         'xml_marshaller', # needed to dump information
         'GitPython', #needed for git manipulation into slaprunner
-        'netifaces', 'rpdb'
+        'netifaces',
       ] + additional_install_requires,
       extras_require = {
         'lampconfigure':  ["mysql-python"], #needed for MySQL Database access