When deleting services and the respective load balancer
with using ovn-octavia provider, the lb sg is not deleted.
This commit fixes the issue by removing the LB sg creation
when the octavia provider is ovn-octavia, as that sg is not
really enforced.
Closes-bug: 1880207
Change-Id: I2c77b1d0ac682008ff6c31781d6075c208c689d0