Fixes SDR tasks in queue , oldest tasks should go first. #438

Job	Run time
ci-lint	18s
build-debug	4m 19s
build-forest	4m 22s
build-calibnet	4m 10s
build-2k	4m 14s
build-mainnet	4m 27s
gen-check	9m 48s
gofmt	23s
lint	3m 22s
mod-tidy-check	33s
setup-params	5s
test (test-itest-curio, ./itests/curio_test.go)	7m 40s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 45s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 12s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 56s
	52m 34s

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