[VOL-4292] OpenOLT Adapter changes for gRPC migration

Change-Id: I5af2125f2c2f53ffc78c474a94314bba408f8bae
diff --git a/vendor/github.com/phayes/freeport/.gitignore b/vendor/github.com/phayes/freeport/.gitignore
new file mode 100644
index 0000000..1521c8b
--- /dev/null
+++ b/vendor/github.com/phayes/freeport/.gitignore
@@ -0,0 +1 @@
+dist