Moved interop client script to the same directory as other scripts. This also moves it into the filegroup for the opensource build.

Change on 2014/12/15 by mlumish <mlumish@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=82175252

src/php/bin/interop_client.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+set +e
+cd $(dirname $0)
+php -d extension_dir=../ext/grpc/modules/ -d extension=grpc.so \
+  ../tests/interop/interop_client.php $@ 1>&2