integration tests: ImageTagTest tries to assert that uppercase tags cannot be added to docker images, but it fails to

ImageTagTest tries to assert that uppercase tags cannot be added to docker images. But it has 2 flaws:

• it tries to assert the existence of an error dialog (when providing an uppercase tag) via

  new ShellWithTextIsAvailable("Error tagging image to <" + imageTagUppercase + ">")

  but ShellWithTextIsAvailable is an AbstractWaitCondition. So it has no effect at all

• the docker tooling wont prevent you from providing an uppercase tag. It will actually accept it, send it to the daemon and then display it. No error occurrs. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=509223

The assertion itself is absolutely correct. The cmd line wont accept uppercase letters in a tag.