introduced test.config for XMPP connection

test.config have following contents

xmpp.host=54.249.240.6
auction.id=auction-item-54321@localhost
auction.password=auction
bidder1.id=bidder-1@localhost
bidder1.password=bidder
bidder2.id=bidder-2@localhost
bidder2.password=bidder

all id should be 'JID' format