Ensure /etc/rpc-release ends in line-feed

Unlike other release files in /etc, the rpc-release did not have a
proper line-feed at the end of the file.

- Change version recipe to add LF to /etc/rpc-release

Issue rcbops/chef-cookbooks#938

(cherry picked from commit af1beef)

recipes/version.rb

@@ -18,8 +18,10 @@
 #
 
 # drop the version of this converged release into a file for support purposes
+version_string = run_context.cookbook_collection[cookbook_name].metadata.version
+
 file "/etc/rpc-release" do
-  content run_context.cookbook_collection[cookbook_name].metadata.version
+  content "#{version_string}\n"
   mode "0644"
   owner "root"
   group "root"