SEBA-902 single-olt tests;
Pin protoc-gen-go to 1.3.2 to resolve compatibility issue;
Run go mod tidy / go mod vendor on importer;
Add Go Module support to demotest

Change-Id: Ifde824fc9a6317b0adc1e12bea54ee1f9b788906
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/settings.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/settings.go
index 516c823..12c04c4 100644
--- a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/settings.go
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/settings.go
@@ -38,7 +38,7 @@
 // s := NewSettings(AssumePreAuthentication(true))
 func AssumePreAuthentication(b bool) func(*Settings) {
 	return func(s *Settings) {
-		s.disablePAFXFast = b
+		s.assumePreAuthentication = b
 	}
 }