lmrpc: Maintain local piecerefs #102

Job	Run time
ci-lint	19s
build-forest	4m 27s
build-2k	4m 23s
build-debug	4m 12s
build-calibnet	4m 14s
build-mainnet	4m 5s
gen-check	5m 18s
gofmt	18s
lint	3m 2s
setup-params	4s
mod-tidy-check	35s
test (test-itest-curio, ./itests/curio_test.go)	4m 41s
test (test-all, `go list ./... \| grep -v curio/itests`)	2m 31s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	2m 32s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 49s
	42m 30s

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