Disable AWS X-Ray in resource-api until it's needed.

[epf]

trafficstars

The resource-api microservice would immediately error out and stop working for me when it was unable to contact the x-ray daemon. I don't remember if this was a problem when I was using the image from your Docker Hub, but it definitely wasn't working when I started building my own images on CodeBuild.

This patch adds a configurable AWS_XRAY_SDK_ENABLED variable to the helm template and keeps it disabled until we're ready for it with the v3 deployment in the AppMesh chapter.