CWL: always set validate and validate_regions
CWL: always set validate and validate_regions

CWL batching requires all outputs present (and nil if unset), but the
previously set None defaults do not pass any command line arguments to
the batch command so they're not included in the output. Thanks
to @sguthrie

biocyberman/bcbio-nextgen,vladsaveliev/bcbio-nextgen,biocyberman/bcbio-nextgen,brainstorm/bcbio-nextgen,brainstorm/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,lbeltrame/bcbio-nextgen,biocyberman/bcbio-nextgen,brainstorm/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,vladsaveliev/bcbio-nextgen,chapmanb/bcbio-nextgen,mjafin/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,mjafin/bcbio-nextgen,a113n/bcbio-nextgen,mjafin/bcbio-nextgen