[SERVER-9006] Support projection on ServerStatus sections, and defaulting exclusion - MongoDB

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Extend support for full projection for each ServerStatus section.

And allow toggling the default inclusion state via "$default" or "$excludeByDefault".

> db.serverStatus({$default:0, mem:1, metrics:{record:1, "ttl.passes":1}})

	"host" : "pans.local",

	"version" : "2.5.0-pre-",

	"process" : "mongod",

	"pid" : 20578,

	"uptime" : 400,

	"uptimeMillis" : NumberLong(399493),

	"uptimeEstimate" : 369,

	"localTime" : ISODate("2013-03-18T00:12:07.147Z"),

	"mem" : {

		"bits" : 64,

		"resident" : 39,

		"virtual" : 2727,

		"supported" : true,

		"mapped" : 272

},

	"metrics" : {

		"record" : {

			"moves" : NumberLong(0)

},

		"ttl" : {

			"passes" : NumberLong(6)

},

	"ok" : 1