map tree #1's root to tree #2's root
map tree #1's root to tree #2's root

This fixes a off-by-one bug.  This mapping has to be set explicitly
because the subsequent recursive mapping generator needs to stop
just short of the root.

Change-Id: If749f88a6a7fb7b036ea49e81637187eaf14ad0d

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