[SERVER-27852] CLI formatter for doubles should emit {value}.0 for doubles with no fractional component - MongoDB

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A common thing to do in the CLI is this:

> db.foo.findOne();

	"_id" : ObjectId("588d3099827f74e88834ba88"),

	"K_dbl" : 3,

...

and then copy and paste the output somewhere. As the field name hints here, K_dbl is double:

Buzzs-MacBook-Pro-2:stuff buzz$ sh runt walkMongo -d testX -c foo --justOne

_id: org.bson.types.ObjectId: 588d3099827f74e88834ba88

K_dbl: java.lang.Double: 3.0

...

We really should add ".0" to make it totally obvious this is a double.