Deleting statistics tables from resource usage page

The tables were interpreting the stats in a wrong way, for some stats
it's not even easily possible to get those stats. We need to go through
each statistic separately and document it in the Ceilometer docs first.

Then it's more likely that these table stats will be distributed in
various tables in dashboard in the form of sparklines so these pages
won't be needed.

Fixes bug 1249279

Change-Id: Ib8c110f5d66fae50df12f8f0beeb99c2b2d00bf6
Merge "Deleting statistics tables from resource usage page"