Updated warnings for potential switch w/o defining switch regions

Related to #1463

Change-Id: I76da771b9960b770028bc75a260072588d0699af
Merge release-4-6 into release-5-0

Conflicts:
	kernel/nb_kernel_ElecEwSw_VdwBhamSw_GeomW4P1/reference.warn
	kernel/nb_kernel_ElecEwSw_VdwLJSw_GeomW4P1/reference.warn

Change-Id: I853600fcebfd007e9762a32fc933b7a4e07e51e6