Shell access for Sean Pringle

New DBA. Key from https://office.wikimedia.org/wiki/User:SPringle_%28WMF%29

I assume he will be given shell access at some point. Please merge
this to approve his request.

Change-Id: I5e517866ea8efe029eef9e16b73f2f2acd6f81c7
Merge "Shell access for Sean Pringle" into production