Remove clang-format template: this does not need to be bound to the rest of clang versioning

templates/tools/dockerfile/grpc_clang_format/Dockerfile.template

@@ -1,23 +0,0 @@
-%YAML 1.2
---- |
-  # Copyright 2015 gRPC authors.
-  #
-  # Licensed under the Apache License, Version 2.0 (the "License");
-  # you may not use this file except in compliance with the License.
-  # You may obtain a copy of the License at
-  #
-  #     http://www.apache.org/licenses/LICENSE-2.0
-  #
-  # Unless required by applicable law or agreed to in writing, software
-  # distributed under the License is distributed on an "AS IS" BASIS,
-  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  # See the License for the specific language governing permissions and
-  # limitations under the License.
-  
-  FROM debian:jessie
-  
-  <%include file="../clang_format.include"/>
-  ADD clang_format_all_the_things.sh /
-  CMD ["echo 'Run with tools/distrib/clang_format_code.sh'"]
-  
-