replace input amqp url to AMQP::Address

[lushengguo]

AMQP::Address cannot correctly parse url when password contains '@', randomly generated password always contains this character

eg: AMQP::Address(amqp:://admin:admin@123@127.0.0.1:5672/).hostname() will be 123@127.0.0.1

[vmitkov]

Thanks for the offer. I'd prefer to make another ctor for this case. I'll do it soon.
I'd also leave the ctor parameter "AMQP::Address address" instead of "AMQP::Address&& address" since that allows the "address" parameter to be used as both an l-value and an r-value.