Refactor security documentation for 2.5.2
Addressing comments
Clearer terms for the JASPI auth handler
Merge branch 'release/2.5.0' into feature/2.5.2-security-docs-refactor
Move the security section up one level, adjust references and tables.
Small edits per comments.
Fixed some broken links, added two links to the appendices, and edited copy as per comments.
Add a link helping with enabling access log security.
Change label to configuration-security. Remove unnecessary link.
Security re-factoring.
Fix broken link, add a source code link.
Copy changes, plus move links and replacements so that they are with their targets.
Copy changes.
Tighten up copy.
Small changes.
Merge pull request #604 from caskdata/feature/2.5.2-security-docs-refactor

Refactor security documentation for 2.5.2