Initial checkin of gRPC to third_party/

third_party/grpc/tools/dockerfile/distribtest/ruby_centos7_x64/Dockerfile

-# Copyright (C) 2013 Google Inc. All rights reserved.
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
 #
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
 # in the documentation and/or other materials provided with the
 # distribution.
 #     * Neither the name of Google Inc. nor the names of its
 # contributors may be used to endorse or promote products derived from
 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-"""Module to share global variables (includes and interfaces) across modules."""
+FROM centos:7
 
-includes = set()
-interfaces = {}
+RUN yum install -y ruby
+
+RUN gem install bundler