RFR: 7903093: Detect invalid class names in CleanAction [v3]

[Christian Stein]

> Check the validity of all given class names by delegating the check to the `javax.lang.model.SourceVersion#isName` method.

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Continue with next arg on valid name

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Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/53/files
  - new: https://git.openjdk.java.net/jtreg/pull/53/files/936959a7..6bdd553c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=53&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=53&range=01-02

  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/53.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/53/head:pull/53

PR: https://git.openjdk.java.net/jtreg/pull/53