AMQP vhost should not contain leading / from URL path

Change-Id: I8ca1645a88e3e374b24ea09af4a69059a0ff2468
Signed-off-by: Maciej Borzecki <maciej.borzecki@open-rnd.pl>
Signed-off-by: Maciej Borzecki <maciek.borzecki@gmail.com>
Merge pull request #41 from open-rnd/uri-vhost

AMQP vhost should not contain leading / from URL path