NXP-11660: Relax .xls MIME type in test: can also be 'x-msexcel'
NXP-11660: Relax .xls MIME type in test: can also be 'x-msexcel'

loopingz/nuxeo-drive,IsaacYangSLA/nuxeo-drive,arameshkumar/base-nuxeo-drive,loopingz/nuxeo-drive,ssdi-drive/nuxeo-drive,arameshkumar/base-nuxeo-drive,DirkHoffmann/nuxeo-drive,rsoumyassdi/nuxeo-drive,rsoumyassdi/nuxeo-drive,arameshkumar/nuxeo-drive,arameshkumar/nuxeo-drive,DirkHoffmann/nuxeo-drive,rsoumyassdi/nuxeo-drive,ssdi-drive/nuxeo-drive,loopingz/nuxeo-drive,rsoumyassdi/nuxeo-drive,loopingz/nuxeo-drive,IsaacYangSLA/nuxeo-drive,DirkHoffmann/nuxeo-drive,arameshkumar/base-nuxeo-drive,ssdi-drive/nuxeo-drive,DirkHoffmann/nuxeo-drive,arameshkumar/nuxeo-drive,IsaacYangSLA/nuxeo-drive,arameshkumar/base-nuxeo-drive,DirkHoffmann/nuxeo-drive,loopingz/nuxeo-drive,IsaacYangSLA/nuxeo-drive,IsaacYangSLA/nuxeo-drive,arameshkumar/nuxeo-drive