Description of problem:
VdsManager.OnTimer is triggered often (every 3-4 seconds) for each Vds. During the OnTimer method, an instance of VDS is loaded using a slow performing database query. 

Version-Release number of selected component (if applicable):


How reproducible:
Run ovirt-engine and connect with a profiler to the code.

Steps to Reproduce:
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Actual results:
select from VDS view

Expected results:
select from VdsDynamic table.

Additional info:
VdsManager and VdsUpdateRuntimeInfo mostly use the VdsDynamic data, and do not require the complete VDS object. This will greatly improve database performance.