add Giuseppe (oblivian) to admins::roots

follow-up to Ib79ba97b6171713c8f48292260241cce3553aa5b

where we created his account.

this gives him root access. Giuseppe is a new ops member. 

key has already been confirmed

RT #7169

Change-Id: Ife47deea114261fc80d8edc2bdb4829b1afad4cd
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>
Merge "add Giuseppe (oblivian) to admins::roots" into production