Fix ChaosMonkey documentation code block rendering

The code blocks in document for ChaosMonkey isnot rendered correctly. Fix them and also add few more example. See 

• https://github.com/apache/hbase/blob/master/src/main/asciidoc/_chapters/developer.adoc#1054-chaosmonkey-without-ssh or
• https://hbase.apache.org/book.html#_chaosmonkey_without_ssh