QPID-4714 Moved _delegate.closeConnection method inside a finally block
to ensure the TCP connection is closed in case an exception is thrown
from any of the methods above.

(cherry picked from commit 874b973366824fba1ae502b10c9a5b66c11e4779)

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1477705 13f79535-47bb-0310-9956-ffa450edef68