UI Tests - Stabilize all tests on one platform

We need to stabilize all test classes at least for one platform (Fedora). There are still some random failures, well-known failures, errors, ...

There is a job, which executes all available tests subsequently on regular basis - https://jbdsis-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Fuse%20Tooling/job/devstudio-11-fuse-all/

We need to:

• fix failures/errors --> test should fail only with link to existing JIRA issue in product
• add missing test classes --> e.g. ConfigurationsEditor..., RegresionTests, ...

The mentioned job could be used for verification of our PRs as well!

We also need to fix https://jbdsis-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Fuse%20Tooling/job/devstudio-11-fuse-project/