RFR: 7048: No matter how funny java.rmi.server.hostname resolves, you should alway be able to connect to yourself

[Marcus Hirt]

So, simply set up the address properly always if connecting to ourselves, even if we could resolve a stub address.

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Commit messages:
 - 7048: Ensure self monitoring even if we happened to resolve an exported address

Changes: https://git.openjdk.java.net/jmc/pull/178/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=178&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7048
  Stats: 15 lines in 1 file changed: 7 ins; 7 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/178.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/178/head:pull/178

PR: https://git.openjdk.java.net/jmc/pull/178