Change UIDs for a bunch of users:

awight
cmjohnson
gmaxwell
cmcmahon
diederik
ebernhardson
gjg
gwicke
halfak
jdlrobson
jforrester
jgreen
kaldari
khorn
krinkle
kwang
marc
maryana
maxsem
milimetric
mlitn

Change-Id: I3d846da143c0eb9e653ed09d533781b5fe45737a