Looks like we need to store the decoded version in the
database, not the encoded version...ie:
rabbit://the=user:the=password@hostname:5672//
instead of:
rabbit://the%3Duser:the%3Dpassword@hostname:5672//
Once we build up the transport_url and transform it into
a string, we just call unquote to convert %xx escapes back
to their single-character equivalent.
Closes-Bug: #1406598
Change-Id: I34be01de08f515c5931ff04e1eaf9815e3c2fa82