Sync tenant changes to local object too

Change-Id: Iff310971005dcdfad65fdd45f58d098a13ba0567
Always set quota to 0 at over limit

Can't imagine this actually being a problem, since most users won't be
destroying/creating instances very often and the dashboard is clear
about what's happening.

Change-Id: I269221f20da1f5c628ea207e8753a4a42a4fb41a
Customize email subjects

Change-Id: Ib0f04fb6b62103d653f31a3103be73c82a76aa41