getNodeByUUID can not find node when receiving logs

[javuto]

Overview

The code to enroll new clients automatically makes the UUID uppercase. In certain environments, for example docker, the UUID is extracted and submitted as lowercase, so the function getNodeByUUID can not find the node when trying to update the metadata or log status/result logs. This is the error seen in the logs:

osquery-ubuntu18    | I0710 17:30:03.995153    26 tls.cpp:253] TLS/HTTPS POST request to URI: https://osctrl-nginx/dev/log
osctrl-nginx        | 172.25.0.3 - - [10/Jul/2020:17:30:04 +0000] "POST /dev/log HTTP/1.1" 200 22 "-" "osquery/4.4.0" "-"
osctrl-tls          | dispatch.go:15: error updating metadata getNodeByUUID record not found
osctrl-tls          | dispatch.go:31: error refreshing last result getNodeByUUID record not found

Proposed solution

Every time the UUID is looked up it will be uppercase'd so consistency will be achieved and this will not affect metadata updates or logging ability.