Use different ports in the TCP/UDP testcases with the first set and
the second set (increment the original ports by 10)

This avoids issues where the first listening socket might not be torn
down by the time it makes it to the second set of testcases.

The sockets should likely only be setup once, but this keeps in the
spirit of the original testcases, so this will be easier to backport
to ^/stable/9

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division