Support a reporting via Syslog (#604)

* Support a reporting via syslog

* Update dependencies

config/config_test.go

@@ -0,0 +1,63 @@
+package config
+
+import (
+	"testing"
+)
+
+func TestSyslogConfValidate(t *testing.T) {
+	var tests = []struct {
+		conf              SyslogConf
+		expectedErrLength int
+	}{
+		{
+			conf:              SyslogConf{},
+			expectedErrLength: 0,
+		},
+		{
+			conf: SyslogConf{
+				Protocol: "tcp",
+				Port:     "5140",
+			},
+			expectedErrLength: 0,
+		},
+		{
+			conf: SyslogConf{
+				Protocol: "udp",
+				Port:     "12345",
+				Severity: "emerg",
+				Facility: "user",
+			},
+			expectedErrLength: 0,
+		},
+		{
+			conf: SyslogConf{
+				Protocol: "foo",
+				Port:     "514",
+			},
+			expectedErrLength: 1,
+		},
+		{
+			conf: SyslogConf{
+				Protocol: "invalid",
+				Port:     "-1",
+			},
+			expectedErrLength: 2,
+		},
+		{
+			conf: SyslogConf{
+				Protocol: "invalid",
+				Port:     "invalid",
+				Severity: "invalid",
+				Facility: "invalid",
+			},
+			expectedErrLength: 4,
+		},
+	}
+
+	for i, tt := range tests {
+		errs := tt.conf.Validate()
+		if len(errs) != tt.expectedErrLength {
+			t.Errorf("test: %d, expected %d, actual %d", i, tt.expectedErrLength, len(errs))
+		}
+	}
+}