The ports used by the metrics test (such as 8081 and 8025) are sometimes
bound by other services.  Since the tests never actually connects to the
service, there's no requirement that these ports be specified, only that
they be different, so ephemeral ports are the better choice.

Change-Id: I52f9ddaac0435c50e49dccf64309a132ae933fb7
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>