Added request duration in RouteServlet

[qatools-ci]

SonarQube analysis reported 3 issues:

• 1 critical
• 2 major

Watch the comments in this conversation to review them. Note: the following issues could not be reported as comments because they are located on lines that are not displayed in this pull request:

• The Cyclomatic Complexity of this method "doPost" is 11 which is greater than 10 authorized.
• Refactor this code to not nest more than 3 if/for/while/switch/try statements.
• Remove this misleading mutable servlet instance fields or make it "static" and/or "final"

[vania-pooh]

Although PR builds seem to be broken, will merge this as this affects only logging.