add account for Dmitry Brant

for access: stat1003/releases (done separately)

requestor: Yuvi
approved by: Tomasz

UID: 4910 / user: dbrant (match LDAP)

RT #7399

ssh key:
https://office.wikimedia.org/w/index.php?title=User:DBrant_%28WMF%29&oldid=110611

Change-Id: I3126b11f34021306d04c528925bb7d156dc7a27a