mediawiki: re-include deployment users

For some reason, only ops are included as login users on the appservers
at the moment, resulting in strange behaviour on freshly installed ones
as mw1151, see RT #7671.

This change is intended to re-include them.

Change-Id: I215909593218cf4970c08931a0897e44f600bb43
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>