Turn off discrete vtkCmbMoabReader by default.

By default, the exodus session should handle exodus files. The vtkCmbMoabReader in discrete session is only available for debugging purpose.
Status Job ID Name Coverage
  External
passed cdash

passed kwrobot-branch-check

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

failed smtk-endor-linux-shared-relwithdebinfo

00:00:11