get the baseline file's path from the command line
get the baseline file's path from the command line

This is an improvement over our previous approach of constructing
the path to the baseilne file from the testing directory.

Change-Id: I2dc0e1354c381ff770475ff2ab7f561b0122e582

jmerkow/VTK,jmerkow/VTK,sumedhasingla/VTK,sumedhasingla/VTK,ashray/VTK-EVM,jmerkow/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,SimVascular/VTK,demarle/VTK,msmolens/VTK,ashray/VTK-EVM,msmolens/VTK,hendradarwin/VTK,jmerkow/VTK,gram526/VTK,johnkit/vtk-dev,johnkit/vtk-dev,keithroe/vtkoptix,candy7393/VTK,ashray/VTK-EVM,gram526/VTK,sankhesh/VTK,SimVascular/VTK,hendradarwin/VTK,sankhesh/VTK,demarle/VTK,SimVascular/VTK,keithroe/vtkoptix,jmerkow/VTK,SimVascular/VTK,msmolens/VTK,sumedhasingla/VTK,keithroe/vtkoptix,hendradarwin/VTK,mspark93/VTK,demarle/VTK,berendkleinhaneveld/VTK,mspark93/VTK,msmolens/VTK,ashray/VTK-EVM,sankhesh/VTK,keithroe/vtkoptix,ashray/VTK-EVM,hendradarwin/VTK,msmolens/VTK,SimVascular/VTK,ashray/VTK-EVM,demarle/VTK,demarle/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,sumedhasingla/VTK,mspark93/VTK,jmerkow/VTK,keithroe/vtkoptix,gram526/VTK,ashray/VTK-EVM,gram526/VTK,keithroe/vtkoptix,msmolens/VTK,johnkit/vtk-dev,gram526/VTK,mspark93/VTK,jmerkow/VTK,candy7393/VTK,msmolens/VTK,berendkleinhaneveld/VTK,hendradarwin/VTK,msmolens/VTK,candy7393/VTK,demarle/VTK,candy7393/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,demarle/VTK,hendradarwin/VTK,SimVascular/VTK,johnkit/vtk-dev,mspark93/VTK,keithroe/vtkoptix,candy7393/VTK,berendkleinhaneveld/VTK,mspark93/VTK,mspark93/VTK,candy7393/VTK,jmerkow/VTK,candy7393/VTK,sumedhasingla/VTK,sumedhasingla/VTK,ashray/VTK-EVM,demarle/VTK,gram526/VTK,johnkit/vtk-dev,candy7393/VTK,sankhesh/VTK,sumedhasingla/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,sankhesh/VTK,hendradarwin/VTK,mspark93/VTK,johnkit/vtk-dev,SimVascular/VTK,johnkit/vtk-dev,gram526/VTK,sankhesh/VTK,gram526/VTK