add ingress provision proposal

[mqliang]

This is a revised proposal of #275. It built upon the initial "loadbalancer provision" idea of #275 , and combined with ideas and feedbacks from community.

cc @m1093782566 @haibinxie
cc @kubernetes/sig-network-proposals

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[m1093782566]

/assign @thockin

[m1093782566]

@kubernetes/huawei

[thockin]

We should not do anything with this until AFTER the sig deep-dive next week, which is particularly focused on Ingress, and the results of which could modify the landscape.

[m1093782566]

@thockin

Would you please give us the feedback of sig deep-dive on this proposal?

[thockin]

The discussion is not done. Unfortunately the deep-dive was not long enough to cover the whole topic. Either @bowei or @nicksardo or I will be publishing the proposal in more detail soon.

[mqliang]

@thockin @bowei @nicksardo Any progress?

[m1093782566]

/assign @bowei

for inputs :)

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