support configuring an explict proxy URL for member cluster #302
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What type of PR is this?
/kind feature
What this PR does / why we need it:
As described in #257, some member clusters are behind a proxy, for those clusters need to specify a proxy URL.
Which issue(s) this PR fixes:
Part of #257
Special notes for your reviewer:
The
ProxyURL
provided by kubernetes v1.19+.kubernetes/client-go#351
kubernetes/kubernetes#81443