Change 27512

C. Thomas Tyler
Changed so PROXY_TARGET value is consistently:

* The existing sample value always had to be changed, as the replacement
value REPL_P4P_TARGET_PORT was never substituted, requiring manual
setting when the proxy was added to a topology.
* Using the new value is a reasonable default, and promotes the idea
that proxies should point to the broker on the master host.  (If
brokers are not used, it's an easy tweak to change P4BROKERPORTNUM
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