VOL-1855: Support for techprofile

Also now use voltha-protos repo similar to other 2.x builds
Also a go fmt

Tested with:
voltha-go TP patch: https://gerrit.opencord.org/#/c/14767/
openolt TP patch: https://gerrit.opencord.org/#/c/14771/

Change-Id: I327573af6cd7f54cdfcb9fb4bdbdc24d960f96be
diff --git a/device/device_onu.go b/device/device_onu.go
index 444e953..aafa793 100644
--- a/device/device_onu.go
+++ b/device/device_onu.go
@@ -21,7 +21,7 @@
 	"sync"
 
 	"github.com/opencord/voltha-bbsim/common/logger"
-	openolt "github.com/opencord/voltha-bbsim/protos"
+	openolt "github.com/opencord/voltha-protos/go/openolt"
 	log "github.com/sirupsen/logrus"
 )