Bug #0000268: Code Cleanup in 5.2.x branch
1. making all rewrite and non-rewrite methods located into separate classes with shared interface
2. moved UserGroups session variable setting for Guest users to Session class
3. getIndexFile method was called for rewrite urls, but it it's result was never used
4. method IsHTTPSRedirect moved from Session to kHTTPQuery class
INP-224