NO-JIRA: slim down some header file inclusions

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1428722 13f79535-47bb-0310-9956-ffa450edef68
QPID-4315: Changed Connection management name to be supplied by Link
code on outgoing connections so that the Link code can correlate the
connection with the Link using the name.