codegen: Update Query Protocol generation to always serialized unboxed

[jasdel]

Updates the EC2Query Protocol serializer generation to always serialize unboxed member values to the querystring. This prevents issues with members values never being serialized to the request.

Fixes #1107

[JordonPhillips]

Implementation wise this looks fine, but it seems potentially dangerous to be always serializing zero values. What other operations / parameters have you tested this with?

[jasdel]

This is the rough part about how SDK's handle unboxed members. The API is not supposed to distinguish the difference between unset and zero value (e.g. `false). But in this case with the EC2Query protocol, the API is either treating the value as boxed, which means its modeled wrong, or the field is actually required, but not modeled as so.

In the case of #1107 not modeled as required when it should be seems to be the issue. Whereas InstanceNetworkInterfaceSpecification.DeviceIndex is modeled as an unboxed number but treated as boxed by the API.

	// The position of the network interface in the attachment order. A primary network
	// interface has a device index of 0. If you specify a network interface when
	// launching an instance, you must specify the device index.
	DeviceIndex int32

[jasdel]

So going to close this PR because this solution is not valid for EC2Query since the API is treating these fields as boxed, and returns errors if zero values are sent in request when they are unexpected.