RFR: 8311002: missing @since info in 21 files in jdk.security.auth

[Weijun Wang]

Add `@since` info. JAAS was included in JDK 1.4 and these classes were all in the initial release.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/17969/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17969&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311002
  Stats: 60 lines in 21 files changed: 39 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/17969.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17969/head:pull/17969

PR: https://git.openjdk.org/jdk/pull/17969