Enable user authentication in the AMQP 1.0 driver

The TransportHost class allows user credentials to be supplied as part
of the URL that identifies the host.  Prior to this patch, these
credentials - username and password - were ignored by the AMQP 1.0
driver.  This prevents connections to a message broker that has been
configured to use SASL PLAIN authentication.

Closes-Bug: #1385445
Change-Id: Ib9279ed40b0f4cff62e1c742069c8f49f5625659
Merge "Enable user authentication in the AMQP 1.0 driver"