Adding swalling, maryana and jforrester to bast1001

They have confirmed that they have read
https://wikitech.wikimedia.org/wiki/Server_access_responsibilities

These users will need bastion access to access stat1003 when
base::firewall is turned back on this week

Change-Id: I4e675fb6e011b4fcd6613d9f7bfd1230a1be3db0