Bugfix rntbd diagnostics to include rntbd timeline on the failure

[moderakh]

previously Request Timeline was missing where there is a rntbd failure. This PR fixes that to populate the timeline on the rntbd failure.

{
	"userAgent": "azsdk-java-cosmos/4.6.0-beta.1 MacOSX/10.15.6 JRE/11.0.6",
	"requestLatencyInMs": 5100,
	"requestStartTimeUTC": "23 Sep 2020 20:28:39.607",
	"requestEndTimeUTC": "23 Sep 2020 20:28:44.707",
	"connectionMode": "DIRECT",
	"responseStatisticsList": [{
		"storeResult": {
			"storePhysicalAddress": null,
			"lsn": -1,
			"globalCommittedLsn": -1,
			"partitionKeyRangeId": null,
			"isValid": true,
			"statusCode": 408,
			"subStatusCode": 0,
			"isGone": false,
			"isNotFound": false,
			"isInvalidPartition": false,
			"requestCharge": 0.0,
			"itemLSN": -1,
			"sessionToken": null,
			"exception": "AsyncRntbdRequestRecord({\"args\":{\"transportRequestId\":23335,\"activityId\":\"5d78954a-fddb-11ea-8b39-4d7696684a21\",\"origin\":\"rntbd://10.37.129.3:10253\",\"replicaPath\":\"/apps/DocDbApp/services/DocDbServer10/partitions/a4cb4956-38c8-11e6-8106-8cdcd42c33be/replicas/1p\",\"timeCreated\":\"2020-09-23T20:28:39.612219Z\",\"lifetime\":\"PT5.095147383S\"},\"requestLength\":414,\"responseLength\":-1,\"status\":{\"done\":false,\"cancelled\":false,\"completedExceptionally\":false},\"timeline\":[{\"eventName\":\"created\",\"durationInMicroSec\":\"69\",\"startTime\":\"2020-09-23T20:28:39.612219Z\"},{\"eventName\":\"queued\",\"durationInMicroSec\":\"196\",\"startTime\":\"2020-09-23T20:28:39.612288Z\"},{\"eventName\":\"pipelined\",\"durationInMicroSec\":\"121\",\"startTime\":\"2020-09-23T20:28:39.612484Z\"},{\"eventName\":\"transitTime\",\"durationInMicroSec\":\"5094901\",\"startTime\":\"2020-09-23T20:28:39.612605Z\"},{\"eventName\":\"received\",\"durationInMicroSec\":\"0\",\"startTime\":null},{\"eventName\":\"completed\",\"durationInMicroSec\":\"0\",\"startTime\":null}]})",
			"transportRequestTimeline": [{
				"eventName": "created",
				"durationInMicroSec": "69",
				"startTime": "2020-09-23T20:28:39.612219Z"
			}, {
				"eventName": "queued",
				"durationInMicroSec": "196",
				"startTime": "2020-09-23T20:28:39.612288Z"
			}, {
				"eventName": "pipelined",
				"durationInMicroSec": "121",
				"startTime": "2020-09-23T20:28:39.612484Z"
			}, {
				"eventName": "transitTime",
				"durationInMicroSec": "5095051",
				"startTime": "2020-09-23T20:28:39.612605Z"
			}, {
				"eventName": "received",
				"durationInMicroSec": "0",
				"startTime": null
			}, {
				"eventName": "completed",
				"durationInMicroSec": "181",
				"startTime": "2020-09-23T20:28:44.707656Z"
			}]
		},
		"requestResponseTimeUTC": "23 Sep 2020 20:28:44.707",
		"requestResourceType": "Document",
		"requestOperationType": "Read"
	}],
	"supplementalResponseStatisticsList": [],
	"addressResolutionStatistics": {},
	"regionsContacted": ["https://10.37.129.3:8081/"],
	"retryContext": {
		"retryCount": 0,
		"statusAndSubStatusCodes": null,
		"retryLatency": 0
	},
	"metadataDiagnosticsContext": {
		"metadataDiagnosticList": null
	},
	"serializationDiagnosticsContext": {
		"serializationDiagnosticsList": null
	},
	"gatewayStatistics": null,
	"systemInformation": {
		"usedMemory": "330433 KB",
		"availableMemory": "16446783 KB",
		"systemCpuLoad": "(2020-09-23T20:25:56.641107Z 24.1%), (2020-09-23T20:26:01.641921Z 17.6%), (2020-09-23T20:26:06.642183Z 8.5%), (2020-09-23T20:28:39.607013Z 7.0%), (2020-09-23T20:28:41.644180Z 6.1%), (2020-09-23T20:28:47.186529Z 10.5%)"
	}
}

whereas previously the rntbd transportRequestTimeline was null in the request diagnostics for the failed operations.

[moderakh]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[FabianMeiswinkel]

LGTM with the additional simple test coverage Naveen proposed

[kushagraThapar]

LGTM