xdsclient: Populate total_issued_requests count in LRS load reports (… #80

Job	Run time
vet-proto	18s
tests (vet, 1.22)	2m 33s
tests (extras, 1.22)	2m 51s
tests (tests, 1.22)	3m 58s
tests (tests, 1.22, -race)	5m 45s
tests (tests, 1.22, -race -tags=buffer_pooling)	5m 49s
tests (tests, 1.22, 386)	4m 43s
tests (tests, 1.22, arm64)	6m 29s
tests (tests, 1.21)	3m 47s
	36m 13s

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