Remove Chefspec matchers that are autogenerated now

Signed-off-by: Tim Smith <tsmith@chef.io>

libraries/matchers.rb

-#
-# Cookbook:: rsyslog
-# Library:: matchers
-#
-# Copyright:: 2015-2017, Chef Software, Inc.
-#
-# 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.
-#
-
-if defined?(ChefSpec)
-  def create_rsyslog_file_input(resource_name)
-    ChefSpec::Matchers::ResourceMatcher.new(:rsyslog_file_input, :create, resource_name)
-  end
-end