create shell user for Joel Sahleen

this just creates a user account
but doesn't add it to any groups yet

so it's not the change that actually gives
access, but a prerequisite for it

for event logging access

approved by greg-g

RT: #8609

key: https://office.wikimedia.org/w/index.php?title=User:JSahleen_%28WMF%29&oldid=120072

Change-Id: I04413069903df4300a1fb76225d4a37feb6cea35
Merge "create shell user for Joel Sahleen" into production