Defaults the control plane LB mode to use masquerade forwarding method

[wyike]

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The default local forwarding method is not forwarding to traffic to other servers of IPVS while only forwards traffic to it's uppper layer on local node, thus it cannot serve load balancing function. When Kube-vip masquerade forwarding mode support is ready, we can use it as the default forwarding mode when kube-vip control plane LB is enabled.

reference:
https://linux.die.net/man/8/ipvsadm:

[packet-forwarding-method]
   -g, --gatewaying Use gatewaying (direct routing). This is the default.
   -i, --ipip Use ipip encapsulation (tunneling).
   -m, --masquerading Use masquerading (network access translation, or NAT).

Note: Regardless of the packet-forwarding mechanism specified, real servers for addresses for which there are interfaces on the local node will be use the local forwarding method, then packets for the servers will be passed to upper layer on the local node. This cannot be specified by ipvsadm, rather it set by the kernel as real servers are added or modified

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