Tunnel id update as a resault of ovs restart

Description:
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1.Load Devstuck setup(no vm's configure).
2.Dump controler+compute ovs pipeline to file.(see before_restart.txt file).
3.ovs-restart to controller+compute ovs only
4.Dump controler+compute ovs pipeline to file.(see after_restart.txt file).

Defect
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Diff for both before and after ovs restart - it can be seen that tunnel id change.