BUGFIX:Fix allocation of GhostedGridExtents vector
BUGFIX:Fix allocation of GhostedGridExtents vector

GhostedGridExtents was being allocated as vector of size
N, where N is the number of grids. However, each grid extent
is a 6-tuple and the flat vector must be allocated as 6*N to
fit the ghosted extent for each grid.

Change-Id: I597feffa44f544a218185843c85c9c91be3397a1

johnkit/vtk-dev,mspark93/VTK,SimVascular/VTK,sumedhasingla/VTK,msmolens/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,msmolens/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,keithroe/vtkoptix,gram526/VTK,candy7393/VTK,jmerkow/VTK,biddisco/VTK,msmolens/VTK,keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,mspark93/VTK,msmolens/VTK,aashish24/VTK-old,ashray/VTK-EVM,candy7393/VTK,collects/VTK,keithroe/vtkoptix,candy7393/VTK,collects/VTK,biddisco/VTK,candy7393/VTK,cjh1/VTK,sumedhasingla/VTK,biddisco/VTK,berendkleinhaneveld/VTK,cjh1/VTK,aashish24/VTK-old,keithroe/vtkoptix,keithroe/vtkoptix,aashish24/VTK-old,sumedhasingla/VTK,cjh1/VTK,mspark93/VTK,SimVascular/VTK,sankhesh/VTK,johnkit/vtk-dev,ashray/VTK-EVM,keithroe/vtkoptix,biddisco/VTK,jmerkow/VTK,sumedhasingla/VTK,cjh1/VTK,cjh1/VTK,johnkit/vtk-dev,demarle/VTK,jmerkow/VTK,sumedhasingla/VTK,ashray/VTK-EVM,jmerkow/VTK,mspark93/VTK,collects/VTK,hendradarwin/VTK,collects/VTK,candy7393/VTK,candy7393/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,ashray/VTK-EVM,mspark93/VTK,mspark93/VTK,gram526/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,sankhesh/VTK,sankhesh/VTK,aashish24/VTK-old,hendradarwin/VTK,demarle/VTK,sumedhasingla/VTK,johnkit/vtk-dev,SimVascular/VTK,aashish24/VTK-old,biddisco/VTK,cjh1/VTK,demarle/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,hendradarwin/VTK,demarle/VTK,jmerkow/VTK,msmolens/VTK,johnkit/vtk-dev,sankhesh/VTK,collects/VTK,hendradarwin/VTK,jmerkow/VTK,SimVascular/VTK,gram526/VTK,sumedhasingla/VTK,msmolens/VTK,keithroe/vtkoptix,gram526/VTK,sankhesh/VTK,demarle/VTK,mspark93/VTK,biddisco/VTK,collects/VTK,jmerkow/VTK,ashray/VTK-EVM,mspark93/VTK,gram526/VTK,gram526/VTK,biddisco/VTK,sankhesh/VTK,hendradarwin/VTK,ashray/VTK-EVM,ashray/VTK-EVM,candy7393/VTK,demarle/VTK,johnkit/vtk-dev,demarle/VTK,hendradarwin/VTK,candy7393/VTK,SimVascular/VTK,msmolens/VTK,msmolens/VTK,johnkit/vtk-dev,gram526/VTK,hendradarwin/VTK,demarle/VTK,jmerkow/VTK,SimVascular/VTK,gram526/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK