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 af1beef8f04436ea0219449a778d0b83fdf779aa)