In the tcpdrop regression test, allow the kernel to allocate us a port rather than using a fixed port number.  This means that the regression test can be run many times in a row without waiting on TIMEWAIT to release a hard-coded port number.
In the tcpdrop regression test, allow the kernel to allocate us a port
rather than using a fixed port number.  This means that the regression test
can be run many times in a row without waiting on TIMEWAIT to release a
hard-coded port number.

MFC after:	3 days
Sponsored by:	Juniper Networks, Inc.

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