[fix bug 808827] Use digest and base64 on calculated usernames to avoid crossing 30 char limit.
[fix bug 808827] Use digest and base64 on calculated usernames to avoid crossing 30 char limit.

justinpotts/mozillians,mozilla/mozillians,glogiotatidis/mozillians-new,akatsoulas/mozillians,chirilo/mozillians,satdav/mozillians,chirilo/mozillians,akarki15/mozillians,johngian/mozillians,brian-yang/mozillians,johngian/mozillians,safwanrahman/mozillians,fxa90id/mozillians,anistark/mozillians,anistark/mozillians,fxa90id/mozillians,fxa90id/mozillians,brian-yang/mozillians,chirilo/mozillians,justinpotts/mozillians,hoosteeno/mozillians,akatsoulas/mozillians,hoosteeno/mozillians,satdav/mozillians,safwanrahman/mozillians,justinpotts/mozillians,akatsoulas/mozillians,mozilla/mozillians,johngian/mozillians,glogiotatidis/mozillians-new,anistark/mozillians,brian-yang/mozillians,mozilla/mozillians,brian-yang/mozillians,fxa90id/mozillians,satdav/mozillians,ChristineLaMuse/mozillians,ChristineLaMuse/mozillians,mozilla/mozillians,akatsoulas/mozillians,anistark/mozillians,chirilo/mozillians,akarki15/mozillians,justinpotts/mozillians,glogiotatidis/mozillians-new,akarki15/mozillians,hoosteeno/mozillians,ChristineLaMuse/mozillians,safwanrahman/mozillians,glogiotatidis/mozillians-new,akarki15/mozillians,safwanrahman/mozillians,johngian/mozillians,hoosteeno/mozillians,satdav/mozillians