rebase: vendor files required for kmip

Signed-off-by: Rakshith R <rar@redhat.com>

vendor/github.com/gemalto/flume/json_encoder.go

@@ -0,0 +1,11 @@
+package flume
+
+import "go.uber.org/zap/zapcore"
+
+// NewJSONEncoder just hides the zap json encoder, to avoid exporting zap
+func NewJSONEncoder(cfg *EncoderConfig) Encoder {
+	if cfg == nil {
+		cfg = &EncoderConfig{}
+	}
+	return zapcore.NewJSONEncoder(zapcore.EncoderConfig(*cfg))
+}