Many other OpenStack services use a `[X-]OpenStack-Request-Id` header
to return a unique identifier for the request. Swift will now return
`X-Trans-Id` as well as `X-Openstack-Request-Id`.
Change-Id: I56cd4738808b99c0a08463f83c100be51a62db05
Closes-Bug: #1572786
environment-networking.rst and edit_hosts_file.txt were left out
when swift-specific content was moved from OpenStack Installation
Guide to swift install-guide.
Change-Id: I334cca0634e3071a7ea285e6ad49ed9baaf7dca8
Partially-Implements: blueprint projectspecificinstallguides
Closes-Bug: 1605021