Revert "In user ev_loop, before start need to clean stop signals"
This caused missing of ev_loop_stop signals.
Can cause hangs in application main thread loop depanding on logic

This reverts commit 4ab7b40dcb570c647ef805141bbf2a8009663ea4.

Change-Id: I1a58fe28fb7a98ee13863bc534df74d4dea33f82
Signed-off-by: Alex Rosenbaum <Alexr@mellanox.com>