add qpid username and password parameters

https://bugzilla.redhat.com/show_bug.cgi?id=1038766
These changes pretty closely follow https://review.openstack.org/#/c/58898/
Fix syntax error
Syntax fix, and removal of duplicated qpid_hostname parameter
Merge pull request #138 from jeckersb/qpid-auth

add qpid username and password parameters