VOL-1489: Message and type needed for interadapter tech profile push

New InterAdapter message type and message needed to share
configured pon specifics between the olt and the onu

This includes work done with this commit:
https://gerrit.opencord.org/#/c/13561/

*Also* adjust Makefile to force the regenaration of voltha.pb
everytime in the event of proto or stub change.

Change-Id: Ic3fb129c8f04630fa0b10c7891f72285a72ea668
diff --git a/protos/voltha_protos/inter_container.proto b/protos/voltha_protos/inter_container.proto
index 1c55d0c..8f33a85 100644
--- a/protos/voltha_protos/inter_container.proto
+++ b/protos/voltha_protos/inter_container.proto
@@ -99,6 +99,7 @@
         METRICS_RESPONSE = 5;
         ONU_IND_REQUEST = 6;
         ONU_IND_RESPONSE = 7;
+        TECH_PROFILE_DOWNLOAD_REQUEST = 8;
     }
 }
 
@@ -116,6 +117,11 @@
     bytes message = 1; // OMCI_REQUEST or OMCI_RESPONSE
 }
 
+message InterAdapterTechProfileDownloadMessage {
+    uint32 uni_id = 1;
+    string path = 2;
+}
+
 message InterAdapterResponseBody {
     bool status = 1;
     oneof payload {