Add pool stats for ShardedConnection

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      Currently, the connPoolStats will only get stats from the extern pool object. This is linked to the pool ScopedDBConnection uses and it does not include the shardConnectionPool.

      Add a new command called "shardConnPoolStats" which will show information on the per thread (incoming connection) connection status. Sample output for a sharded cluster with a single replica set below:

      mongos> db.runCommand( { 'shardConnPoolStats': 1 } )
{
	"hosts" : {
		"test-rs0/dan-tm2:31100,dan-tm2:31101,dan-tm2:31102::0" : {
			"available" : 0,
			"created" : 2
		}
	},
	"replicaSets" : {
		"test-rs0" : {
			"hosts" : [
				{
					"addr" : "dan-tm2:31100",
					"ok" : true,
					"ismaster" : true,
					"hidden" : false,
					"secondary" : false,
					"pingTimeMillis" : 0
				},
				{
					"addr" : "dan-tm2:31101",
					"ok" : true,
					"ismaster" : false,
					"hidden" : false,
					"secondary" : true,
					"pingTimeMillis" : 0
				},
				{
					"addr" : "dan-tm2:31102",
					"ok" : true,
					"ismaster" : false,
					"hidden" : false,
					"secondary" : true,
					"pingTimeMillis" : 0
				}
			],
			"master" : 0,
			"nextSlave" : 0
		}
	},
	"createdByType" : {
		"set" : 2
	},
	"totalAvailable" : 0,
	"totalCreated" : 2,
	"threads" : [
		{
			"hosts" : [
				{
					"host" : "test-rs0/dan-tm2:31100,dan-tm2:31101,dan-tm2:31102",
					"created" : NumberLong(1),
					"avail" : true
				}
			],
			"seenNS" : [
				"test.data"
			]
		},
		{
			"hosts" : [
				{
					"host" : "test-rs0/dan-tm2:31100,dan-tm2:31101,dan-tm2:31102",
					"created" : NumberLong(1),
					"avail" : true
				}
			],
			"seenNS" : [
				"test.data"
			]
		}
	],
	"ok" : 1
}

            Assignee:
            Greg Studer (Inactive)
            Reporter:
            Randolph Tan
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              Created:
              Updated:
              Resolved: