clientscripts: change date format in verifyMD5.sh
clientscripts: change date format in verifyMD5.sh

Default date format uses ":". That's a reserved character for CIFS (samba) mounts, so they can't be stored on them

This commit replaces current format with an UTC ISO8601 compliant output ( 20170605T215337Z )

artefactual/archivematica,artefactual/archivematica,artefactual/archivematica,artefactual/archivematica