RFR: JDK-8275686: Suppress warnings on non-serializable non-transient instance fields in java.rmi

[Joe Darcy]

Another serialization warnings cleanup; this time in java.rmi.

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Commit messages:
 - JDK-8275686: Suppress warnings on non-serializable non-transient instance fields in java.rmi

Changes: https://git.openjdk.java.net/jdk/pull/6055/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6055&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275686
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6055.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6055/head:pull/6055

PR: https://git.openjdk.java.net/jdk/pull/6055