Slow Performance with .Net Dashboards (4347695)

Multiple problems when using .NET dashboards have been identified:

the topology data service doesnt provide observations (metrics) sufficiently fast for them to be used for filtering - this causes slowness on pages with large tables of observations, like the .NET requests dashboard.
querying for topology change counts in timerange isnt done O(1) but by looking through all changes in timerange - this causes slowness of pages with change indication icons, like the .NET domain dashboard
UI null (existence) checks isnt done in O(1) but by looking for observations in timerange
Data rollups dont take advantage of SQLServer hints improving rollup performance
MySql queries for complex observations are not optimal and load too much information


This patch is intended to address slowness on the .NET requests dashboard, particularly when there are a large number of requests in the system which are no longer monitored.

This patch also includes an upgrade related code change (backport) to address a vFoglight issue.