Fix colors of test passed / failed / error icons in Eclipse

Currently we use dark blue color for a failed test. It's not contrast enough compared to the green one.

Furthermore, we use a red background for a "FAIL" status label, which is not consistent. Also, a green background used for a "PASS" label is different from the green dot in the icon.

Current colors used: green-pass, blue-fail, red-error are the same as in Eclipse's JUnit view.

Consider also changing a dot to three different figures to make it accessible for color-blinded people. For instance:

• light green circle - pass
• dark blue triangle - fail
• red square - error