Merge branch 'ticket/2.6.next/5838' into 2.6.next

• ticket/2.6.next/5838: (#5838) Support paths as part of file bucket requests. (#5838) Improve the quality of file bucket specs. (#5838) Make file bucket dipper efficient when saving a file that already exists (#5838) Implemented the "head" method for FileBucketFile::File terminus. (#5838) Reworked file dipper spec to perform less stubbing. (#5838) Added support for HEAD requests to the indirector. (#5838) Refactored error handling logic into find_in_cache. (#5838) Refactored Puppet::Network::Rights#fail_on_deny