Convert test to junit 4, and stub out the additional 3d ref tests we need to pass for #56737

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611877 13f79535-47bb-0310-9956-ffa450edef68
Turns out that .xlsx files can have multiple link tables, add a test file which shows this (support to follow)

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611878 13f79535-47bb-0310-9956-ffa450edef68