VOL-1967 move api-server to separate repository

Current with voltha-go acf0adaf2d91ae72b55192cc8a939e0485918d16

Change-Id: I000ea6be0789e20c922bd671562b58a7120892ae
diff --git a/vendor/google.golang.org/grpc/AUTHORS b/vendor/google.golang.org/grpc/AUTHORS
new file mode 100644
index 0000000..e491a9e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/AUTHORS
@@ -0,0 +1 @@
+Google Inc.