RFR: 5707: Add excludes for password checking rules

[Jean-Philippe Bempel]

Add also unit tests for each rule

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Commit messages:
 - 5707: Add excludes for password checking rules

Changes: https://git.openjdk.java.net/jmc/pull/156/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=156&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-5707
  Stats: 491 lines in 11 files changed: 479 ins; 2 del; 10 mod
  Patch: https://git.openjdk.java.net/jmc/pull/156.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/156/head:pull/156

PR: https://git.openjdk.java.net/jmc/pull/156