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/TGSExchange.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/TGSExchange.go
index 8ad3e55..93ff1db 100644
--- a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/TGSExchange.go
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/TGSExchange.go
@@ -60,7 +60,7 @@
 				return tgsReq, tgsRep, err
 			}
 		}
-		tgsReq, err = messages.NewTGSReq(cl.Credentials.CName(), kdcRealm, cl.Config, tgt, sessionKey, tgsReq.ReqBody.SName, tgsReq.Renewal)
+		tgsReq, err = messages.NewTGSReq(cl.Credentials.CName(), realm, cl.Config, tgsRep.Ticket, tgsRep.DecryptedEncPart.Key, tgsReq.ReqBody.SName, tgsReq.Renewal)
 		if err != nil {
 			return tgsReq, tgsRep, err
 		}
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/client.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/client.go
index 6e4c83c..cc93174 100644
--- a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/client.go
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/client.go
@@ -188,6 +188,18 @@
 	return nil
 }
 
+// AffirmLogin will only perform an AS exchange with the KDC if the client does not already have a TGT.
+func (cl *Client) AffirmLogin() error {
+	_, endTime, _, _, err := cl.sessionTimes(cl.Credentials.Domain())
+	if err != nil || time.Now().UTC().After(endTime) {
+		err := cl.Login()
+		if err != nil {
+			return fmt.Errorf("could not get valid TGT for client's realm: %v", err)
+		}
+	}
+	return nil
+}
+
 // realmLogin obtains or renews a TGT and establishes a session for the realm specified.
 func (cl *Client) realmLogin(realm string) error {
 	if realm == cl.Credentials.Domain() {
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/network.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/network.go
index 19d25e6..493fb2f 100644
--- a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/network.go
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/network.go
@@ -69,49 +69,47 @@
 }
 
 // dialKDCTCP establishes a UDP connection to a KDC.
-func dialKDCUDP(count int, kdcs map[int]string) (conn *net.UDPConn, err error) {
+func dialKDCUDP(count int, kdcs map[int]string) (*net.UDPConn, error) {
 	i := 1
 	for i <= count {
-		udpAddr, e := net.ResolveUDPAddr("udp", kdcs[i])
-		if e != nil {
-			err = fmt.Errorf("error resolving KDC address: %v", e)
-			return
+		udpAddr, err := net.ResolveUDPAddr("udp", kdcs[i])
+		if err != nil {
+			return nil, fmt.Errorf("error resolving KDC address: %v", err)
 		}
-		conn, err = net.DialUDP("udp", nil, udpAddr)
+
+		conn, err := net.DialTimeout("udp", udpAddr.String(), 5*time.Second)
 		if err == nil {
-			err = conn.SetDeadline(time.Now().Add(5 * time.Second))
-			if err != nil {
-				return
+			if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+				return nil, err
 			}
-			return
+			// conn is guaranteed to be a UDPConn
+			return conn.(*net.UDPConn), nil
 		}
 		i++
 	}
-	err = errors.New("error in getting a UDP connection to any of the KDCs")
-	return
+	return nil, errors.New("error in getting a UDP connection to any of the KDCs")
 }
 
 // dialKDCTCP establishes a TCP connection to a KDC.
-func dialKDCTCP(count int, kdcs map[int]string) (conn *net.TCPConn, err error) {
+func dialKDCTCP(count int, kdcs map[int]string) (*net.TCPConn, error) {
 	i := 1
 	for i <= count {
-		tcpAddr, e := net.ResolveTCPAddr("tcp", kdcs[i])
-		if e != nil {
-			err = fmt.Errorf("error resolving KDC address: %v", e)
-			return
+		tcpAddr, err := net.ResolveTCPAddr("tcp", kdcs[i])
+		if err != nil {
+			return nil, fmt.Errorf("error resolving KDC address: %v", err)
 		}
-		conn, err = net.DialTCP("tcp", nil, tcpAddr)
+
+		conn, err := net.DialTimeout("tcp", tcpAddr.String(), 5*time.Second)
 		if err == nil {
-			err = conn.SetDeadline(time.Now().Add(5 * time.Second))
-			if err != nil {
-				return
+			if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+				return nil, err
 			}
-			return
+			// conn is guaranteed to be a TCPConn
+			return conn.(*net.TCPConn), nil
 		}
 		i++
 	}
-	err = errors.New("error in getting a TCP connection to any of the KDCs")
-	return
+	return nil, errors.New("error in getting a TCP connection to any of the KDCs")
 }
 
 // sendKDCUDP sends bytes to the KDC via UDP.
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/passwd.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/passwd.go
index e6d4180..da838ed 100644
--- a/vendor/gopkg.in/jcmturner/gokrb5.v7/client/passwd.go
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/client/passwd.go
@@ -44,7 +44,7 @@
 		return false, err
 	}
 	if r.ResultCode != KRB5_KPASSWD_SUCCESS {
-		return false, fmt.Errorf("error response from kdamin: %s", r.Result)
+		return false, fmt.Errorf("error response from kadmin: code: %d; result: %s; krberror: %v", r.ResultCode, r.Result, r.KRBError)
 	}
 	cl.Credentials.WithPassword(newPasswd)
 	return true, nil
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
 	}
 }