4e5ae36c5b
Apply Swift rolling upgrade based on recommendations from Swift PTL John Dickinson at [1] [1] https://www.swiftstack.com/blog/2013/12/20/upgrade-openstack-swift-no-downtime/ Co-Authored-By: Surya Prakash <singh.surya64mnnit@gmail.com> Change-Id: I99f505438916be2f89b24df20506339604e5bd6e Implements: blueprint apply-service-upgrade-procedure