overlay.py: Don't delete logical switch port before creating it.
overlay.py: Don't delete logical switch port before creating it.

If we delete and re-create the logical port, dynamic addresses change.
So that breaks connectivity. This issue fixes it.

Signed-off-by: Gurucharan Shetty <a1872e333d0e52644f6125da2276530f7ebe5e77@ovn.org>

shettyg/ovn-kubernetes,shettyg/ovn-kubernetes,shettyg/ovn-kubernetes