daemon/logger/fluentd: remove udp, tcp+tls, unixgram, add tls scheme

unix and unixgram were added in cb176c848e, but at
the time, the driver only supported "tcp" and "unix":
cb176c848e/vendor/src/github.com/fluent/fluent-logger-golang/fluent/fluent.go (L243-L261)

support for tls was added in github.com/fluent/fluent-logger-golang v1.8.0, which
was vendored in e24d61b7ef.

the list of currently supported schemes by the driver is: tcp, tls and unix:
5179299b98/vendor/github.com/fluent/fluent-logger-golang/fluent/fluent.go (L435-L463)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/logger/fluentd/fluentd.go

@@ -285,12 +285,12 @@ func parseAddress(address string) (*location, error) {
 	}
 
 	switch addr.Scheme {
-	case "unix", "unixgram":
+	case "unix":
 		if strings.TrimLeft(addr.Path, "/") == "" {
 			return nil, errors.New("path is empty")
 		}
 		return &location{protocol: addr.Scheme, path: addr.Path}, nil
-	case "tcp", "tcp+tls", "udp":
+	case "tcp", "tls":
 		// continue processing below
 	default:
 		return nil, errors.Errorf("unsupported scheme: '%s'", addr.Scheme)

daemon/logger/fluentd/fluentd_test.go

@@ -95,6 +95,24 @@ func TestValidateLogOptAddress(t *testing.T) {
 				host:     "example.com",
 			},
 		},
+		{
+			addr:  "tls://",
+			paths: paths,
+			expected: location{
+				protocol: "tls",
+				host:     defaultHost,
+				port:     defaultPort,
+			},
+		},
+		{
+			addr:  "tls://example.com",
+			ports: validPorts,
+			paths: paths,
+			expected: location{
+				protocol: "tls",
+				host:     "example.com",
+			},
+		},
 		{
 			addr:        "://",
 			expectedErr: "missing protocol scheme",
@@ -103,6 +121,18 @@ func TestValidateLogOptAddress(t *testing.T) {
 			addr:        "something://",
 			expectedErr: "unsupported scheme: 'something'",
 		},
+		{
+			addr:        "udp://",
+			expectedErr: "unsupported scheme: 'udp'",
+		},
+		{
+			addr:        "unixgram://",
+			expectedErr: "unsupported scheme: 'unixgram'",
+		},
+		{
+			addr:        "tcp+tls://",
+			expectedErr: "unsupported scheme: 'tcp+tls'",
+		},
 		{
 			addr:        "corrupted:c",
 			expectedErr: "invalid port",