bridge: fix IPv6 address order assumption in test

Linux kernel v7.0 changed same-scope IPv6 address insertion from
prepend to append (torvalds/linux@cb3de96eea66),
causing AddrList to return addresses in insertion order rather than
reverse order. Replace index-based checks in checkBridgeIPs with
ContainElement to make the test order-independent.

Signed-off-by: Yusho Yamaguchi <ys-yamaguchi@kddi.com>

Author: yushoyamaguchi

plugins/main/bridge/bridge_test.go

@@ -2255,11 +2255,13 @@ var _ = Describe("bridge Operations", func() {
 						addrs, err := netlinksafe.AddrList(bridge, family)
 						Expect(err).NotTo(HaveOccurred())
 						Expect(addrs).To(HaveLen(expNumAddrs))
-						addr := addrs[0].IPNet.String()
-						Expect(addr).To(Equal(cidr0))
+						addrStrs := make([]string, len(addrs))
+						for i, a := range addrs {
+							addrStrs[i] = a.IPNet.String()
+						}
+						Expect(addrStrs).To(ContainElement(cidr0))
 						if cidr1 != "" {
-							addr = addrs[1].IPNet.String()
-							Expect(addr).To(Equal(cidr1))
+							Expect(addrStrs).To(ContainElement(cidr1))
 						}
 					}