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test(e2e): make ServiceCIDR case adapt to cluster IP family

The original spec hardcoded a /24 IPv4 CIDR and ovn40services, which
times out on IPv6-only clusters where the v4 ipset doesn't exist and
the apiserver wouldn't accept a mismatched family in the ServiceCIDR
either.

Pick the CIDR(s) per f.HasIPv4()/HasIPv6() and route the ipset name
through the family of each CIDR so the same case works on v4-only,
v6-only, and dual stack.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>