Update WS SSL documentation

Update unclear language in intro
Fix link to api, add lines about allowing legacy hello messages.
Fix link to heartbleed.com.
Add key management link.
Make headers clearer in CertificateValidation.md, add link to how to configure jdk.certpath.disabledAlgorithms.
Provide a more accurate discussion of how to set jdk.tls.disabledAlgorithm.
Fill out the strictest example with key generation and disabled algorithms.
Upgrade certificate generation
Fix link to JSSERefGuide
Put everything into shell scripts with comments