Never import servermanager in server-side filters.

servermanager.py is meant for Client only. None of the server-side classes
should ever import it. This fixes find-data dialog and others when used in
client-server mode

Change-Id: I5075486da44f3d5803df03fea75d23f7986dead2
Merge topic 'refactor_python_interpretor' into next

f54399a Never import servermanager in server-side filters.