RFR: 8267751: (test) jtreg.SkippedException has no serial VersionUID [v2]

[Roger Riggs]

> The class `test/lib/jtreg/SkippedException.java` is missing a serialVersionUID causing additional noise in compiler output of tests.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Removed unintended classfile

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4197/files
  - new: https://git.openjdk.java.net/jdk/pull/4197/files/8c629b22..7aff0846

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4197&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4197&range=00-01

  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4197/head:pull/4197

PR: https://git.openjdk.java.net/jdk/pull/4197