RFR: 8377063: Add EchoPassword.java to manual group

[Mikhail Yankelevich]

Added EchoPassword.java to a security manual group

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Commit messages:
 - JDK-8377063: Add EchoPassword.java to manual group

Changes: https://git.openjdk.org/jdk/pull/29544/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29544&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377063
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29544.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29544/head:pull/29544

PR: https://git.openjdk.org/jdk/pull/29544