https://issues.apache.org/jira/browse/AMQ-5345 - improve ldap communication
https://issues.apache.org/jira/browse/AMQ-5346

Prepare for the move to Proton 0.8.  Use the 1.0-SNAPSHOT builds to
start testing against the changes coming in Proton 0.8
Use the defined sources version otherwise we get an error when
generating sources now that we've started using 1.7 code features.
https://issues.apache.org/jira/browse/AMQ-5346

need to call free on the amqp resources now to ensure their state data
is all cleaned up.