tenant: add the option to specify the registrar ip and port
tenant: add the option to specify the registrar ip and port

Signed-off-by: Thore Sommer <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@thson.de>

mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime