STYLE: vtkMRMLNodeTest1: Prepend "Line " in error message.

This change will allow to more easily identify the line associated
with the failing test.

Instead of having an output of the form:

50: 30: TestSomething failed
50: Something went wrong
1/1 Test 0000050: vtkMRMLNodeTest1 .................***Failed 1.12 sec

where the "50:" and the "30:" are hard to distinguish.

This commit changes the output into:

50: Line 30: TestSomething failed
50: Something went wrong
1/1 Test 0000050: vtkMRMLNodeTest1 .................***Failed 1.12 sec

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24702 3bd1e089-480b-0410-8dfb-8563597acbee