Fix the handling of shared IPs (VIP, VRRF, etc.) when unique IP space enforcement is set. #2502
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Fixes: #2501
It's not possible to create duplicate shared IPs in a VRF when unique IP space enforcement is on.
This is due missing parentheses around the whole logical-OR statement which causes "[...] or (
self.vrf and self.vrf.enforce_unique)" to be always true and thus goes further to the duplicate IP address check instead of skipping this check.
Add parentheses for the logical OR-statement that checks the conditions if unique IP space enforcement is on and if the IP address is duplicate.