Release 5.0.0 - Juno

Changes in this release:
* Updated s3token.conf template for Juno
* Added parameter log_name to swift::proxy and swift::storage::server
* Bumped stdlib dependency to >=4.0.0

Change-Id: Ib62984c299b72b6aaeb6bd69e712f3e8cc4df109
Remove deprecated class

* swift::proxy::proxy-logging (deprecated since 3.0.0)

Change-Id: If1d866454292b0b35351c459d22644327f526fec