Improve vulnerability detection for Ubuntu (#6102)

Feature: Improve our capability to detect vulnerable software on Ubuntu hosts

To improve the capability of detecting vulnerable software on Ubuntu, we are now using OVAL definitions to detect vulnerable software on Ubuntu hosts. If data sync is enabled (disable_data_sync=false) OVAL definitions are automatically kept up to date (they are 'refreshed' once per day) - there's also the option to manually download the OVAL definitions using the 'fleetctl vulnerability-data-stream' command. Downloaded definitions are then parsed into an intermediary format and then used to identify vulnerable software on Ubuntu hosts. Finally, any 'recent' detected vulnerabilities are sent to any third-party integrations.

server/test/comparisons.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"reflect"
+	"strings"
 
 	"github.com/davecgh/go-spew/spew"
 	"github.com/google/go-cmp/cmp"
@@ -24,7 +25,7 @@ func ElementsMatchSkipID(t TestingT, listA, listB interface{}, msgAndArgs ...int
 		for _, ps := range p {
 			switch ps := ps.(type) {
 			case cmp.StructField:
-				if ps.Name() == "ID" {
+				if strings.HasSuffix(ps.Name(), "ID") {
 					return true
 				}
 			}
@@ -126,7 +127,6 @@ func ElementsMatchWithOptions(t TestingT, listA, listB interface{}, opts cmp.Opt
 
 // isEmpty gets whether the specified object is considered empty or not.
 func isEmpty(object interface{}) bool {
-
 	// get nil case out of the way
 	if object == nil {
 		return true