Add Samuel Merritt's ring file recovery doc
Add Samuel Merritt's ring file recovery doc

This text from Samuel Merritt (torgomatic) @
https://answers.launchpad.net/swift/+question/208975 details a
proceedure by which ring builder files could be recovered in the
event of their loss. Added it in a new section under troubleshooting.

fixes bug 1054828

Change-Id: Ifdb203dcdf10da83a123cd71bcc7403801a17e5f

AlekhyaMallina-Vedams/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,kairoaraujo/openstack-manuals,potsmaster/openstack-manuals,gongysh2004/openstack-manual,saeki-masaki/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals