Updating Hadoop-Swift documentation

Changes
* removed sections about patching Swift and references to Folsom and
  Grizzly
* adding domain.name and trust.id to list of configuration options
* refactoring example section

Change-Id: I3b82079102f1ef8179f4d31a7a23e76343637cb3
Closes-Bug: #1373066
Merge "Updating Hadoop-Swift documentation"