create shell user for Dan Duvall

realname: Dan Duvall
role: automation engineer
approved by: Greg Grossmeier

UID matches existing labs user

details and
key from: https://office.wikimedia.org/w/index.php?title=User:DDuvall_%28WMF%29&oldid=118319

Change-Id: Ia41aae4d2068618ee89b3ac5863ae9294dceeb76
RT: 8394
Merge "create shell user for Dan Duvall" into production