tests: add function to create uuid per version of test

With blackbox test being deepcopied for each version
of ignition that is being tested this can result in
id collision for keyfields in ignition config. Add a
parse function to blackbox test register to create a
new UUID per version of ignition being tested.

tests/register/register.go

@@ -56,6 +56,7 @@ func Register(tType TestType, t types.Test) {
 	test := types.DeepCopy(t)
 	version, semverErr := semver.NewVersion(test.ConfigMinVersion)
 	test.ReplaceAllVersionVars(test.ConfigMinVersion)
+	test.ReplaceUUIDKeyword()
 	test.ConfigVersion = test.ConfigMinVersion
 	register(tType, test) // some tests purposefully don't have config version
 
@@ -64,6 +65,7 @@ func Register(tType TestType, t types.Test) {
 			if version.LessThan(v) {
 				test = types.DeepCopy(t)
 				test.ReplaceAllVersionVars(v.String())
+				test.ReplaceUUIDKeyword()
 				test.ConfigVersion = v.String()
 				register(tType, test)
 			}

tests/types/types.go

@@ -274,6 +274,12 @@ func (t *Test) ReplaceAllVersionVars(version string) {
 	t.Name += " " + version
 }
 
+// Does a string Replace on `$UUID` to allow it to be unique per version of the test.
+func (t *Test) ReplaceUUIDKeyword() {
+	uuid := uuid.New()
+	t.Config = strings.Replace(t.Config, "$UUID", uuid.String(), -1)
+}
+
 // Deep copy Test struct fields In, Out, MntDevices, SystemDirFiles
 // so each BB test with identical Test structs have their own independent Test copies
 func DeepCopy(t Test) Test {