Updated unit tests for read_esri_ascii change.
Updated unit tests for read_esri_ascii change.

landlab/landlab,cmshobe/landlab,RondaStrauch/landlab,SiccarPoint/landlab,cmshobe/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,decvalts/landlab,laijingtao/landlab,RondaStrauch/landlab,SiccarPoint/landlab,csherwood-usgs/landlab,Carralex/landlab,landlab/landlab,RondaStrauch/landlab,amandersillinois/landlab,ManuSchmi88/landlab,amandersillinois/landlab,Carralex/landlab,landlab/landlab,cmshobe/landlab,decvalts/landlab,laijingtao/landlab,Carralex/landlab,ManuSchmi88/landlab