Update checkstyle-strict.xml by the latest version 8.39 of checkstyle

1.update checkstyle to latest version 8.39
See https://checkstyle.sourceforge.io/config_javadoc.html

• JavadocMethod: remove properties `allowMissingJavadoc,allowMissingThrowsTags,allowThrowsTagsForSubclasses,allowUndeclaredRTE`

• LineLength: change it's parent to Checker

2.update XML dtd: `checkstyle-strict.xml, checkstyle-simple.xml, checkstyleSuppressions.xml`

3.fix code style:

• `QuorumPeer.java, PemReader.java`. Operators like + and ? appear at newlines rather than at the end of the previous line.
• license of `TestApacheCuratorCompatibility.java`. Checkstyle JavadocParagraph:`<p>` tag should be placed immediately before the first word.