VOL-1460 Updated core to use voltha-protos instead of local protos
Moved protos to python directory in order to maintain functionaly of containers built there.
Added capability to do local builds of protos
Added instructions on running dep ensure for getting protos.
Updated github.com/golang/protobuf version to v1.3.1

Change-Id: Ia6ef55f07f0d5dcb5b750d7c37b21b71db85bfc4
diff --git a/vendor/gopkg.in/Shopify/sarama.v1/record_batch.go b/vendor/gopkg.in/Shopify/sarama.v1/record_batch.go
index e0f183f..a36f7e6 100644
--- a/vendor/gopkg.in/Shopify/sarama.v1/record_batch.go
+++ b/vendor/gopkg.in/Shopify/sarama.v1/record_batch.go
@@ -36,6 +36,7 @@
 	Codec                 CompressionCodec
 	CompressionLevel      int
 	Control               bool
+	LogAppendTime         bool
 	LastOffsetDelta       int32
 	FirstTimestamp        time.Time
 	MaxTimestamp          time.Time
@@ -120,6 +121,7 @@
 	}
 	b.Codec = CompressionCodec(int8(attributes) & compressionCodecMask)
 	b.Control = attributes&controlMask == controlMask
+	b.LogAppendTime = attributes&timestampTypeMask == timestampTypeMask
 
 	if b.LastOffsetDelta, err = pd.getInt32(); err != nil {
 		return err
@@ -200,6 +202,9 @@
 	if b.Control {
 		attr |= controlMask
 	}
+	if b.LogAppendTime {
+		attr |= timestampTypeMask
+	}
 	return attr
 }