Import grpcio 0.6.0

And add metadata files using the following command:
get_rust_pkg.py --add3prf -v grpcio-0.6.0 -o grpcio

Test: none
Change-Id: I53cc0feb5c9d24eacb62331b968cab4ec85f60a6
diff --git a/scripts/generate-bindings.sh b/scripts/generate-bindings.sh
new file mode 100755
index 0000000..462b2fa
--- /dev/null
+++ b/scripts/generate-bindings.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# NOTE: 
+# This script is only used when you want to generate bindings yourself.
+# The generated bindings will overwrite grpc-sys/bindings/*
+
+if [ "$ARCH" == "" ]; then
+    ARCH=`uname -p`
+fi
+export UPDATE_BIND=1
+cargo build -p grpcio-sys --target ${ARCH}-unknown-linux-gnu
+rustfmt grpc-sys/bindings/*
+if [ "$(uname -s)" == "Linux" ]; then
+  sed -i '/pub type .*= ::std::os::raw::.*/d' grpc-sys/bindings/*
+fi