fix Yuvi's user name in role for mobile releases

Yuvi should have access to caesium to upload
mobile releases but, as opposed to Brion, he did
not get membership in the "mobileupld" group so
he could not upload.

this is because his username is "yuvipanda" while
the class name is "ypanda".

@caesium:

id yuvipanda
uid=630(yuvipanda) gid=500(wikidev) groups=500(wikidev)

id ypanda
id: ypanda: No such user

id brion
uid=500(brion) gid=500(wikidev) groups=500(wikidev),1002(mobileupld)

Change-Id: Ic0147a4ebcbd88c6920ec509fb73302ae78b3e11
Merge "fix Yuvi's user name in role for mobile releases" into production