grpclb: cache requestConnection if no subchannel created #7434
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An issue was found during CBT RLS client testing: The RLS lb creates grplb child balancer, calls
grpclb.handleResolvedAddress()then immediately callsgrpclb.requestConnection(). The subchannel inGrpclbState.currentPicker.pickListcontains onlyGrpclbState.BUFFER_ENTRYat the momentgrpclb.requestConnection()is called, and therefore therequestConnection()is no-op, and RPC is hanging.