Remoteows test stability

This makes the deegree-wms-remoteows-tests self contained where the deegree 3 demo is involved. It integrates another WMS to be used for remote requests in the same workspace, which is then used as remote resource.

Unfortunately only the deegree 3 based tests are made more stable by this, the umn, esri, mywms and deegree2 tests are not affected.