Change qpid_port to IntOpt

Fixes bug 1161679

Change-Id: I4b64fccbb7871dfab4fb74534514aa269c31f03d
(cherry picked from commit cb6d2ed2c1eda7b72c898b0a61eeed10202b9d54)
Merge "Change qpid_port to IntOpt" into stable/grizzly