git: openjdk/jdk-sandbox: simpleserver: simple-server: refactor mapToPath and add a few additional test scenarios

[Chris Hegarty]

Changeset: e9d3a038
Author:    Chris Hegarty <chris.hegarty at oracle.com>
Date:      2021-08-19 15:33:15 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/e9d3a0380f73cf1345952a772ca763775c391599

simple-server: refactor mapToPath and add a few additional test scenarios

! src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/FileServerHandler.java
! test/jdk/com/sun/net/httpserver/simpleserver/MapToPathTest.java