Disabling privacy triggers authentication errors

[vincentbernat]

Hey!

Applying this patch:

diff --git a/cmd/gosnmpserver/main.go b/cmd/gosnmpserver/main.go
index 1a6c7f4c8faf..3b27dfff29e5 100644
--- a/cmd/gosnmpserver/main.go
+++ b/cmd/gosnmpserver/main.go
@@ -60,9 +62,8 @@ func runServer(c *cli.Context) error {
                                {
                                        UserName:                 c.String("v3Username"),
                                        AuthenticationProtocol:   gosnmp.MD5,
-                                       PrivacyProtocol:          gosnmp.DES,
+                                       PrivacyProtocol:          gosnmp.NoPriv,
                                        AuthenticationPassphrase: c.String("v3AuthenticationPassphrase"),
-                                       PrivacyPassphrase:        c.String("v3PrivacyPassphrase"),
                                },
                        },
                },

We get this:

$ snmpwalk -v 3 -l authNoPriv  -n public -u testuser   -a md5 -A testauth 127.0.0.1:1161 1
Authentication failed for testuser
iso.3.6.1.2.1.1.3.0 = Timeticks: (176926) 0:29:29.26
Authentication failed for testuser
iso.3.6.1.2.1.2.2.1.1.0 = INTEGER: 2