Manual install page needed swift info

The "manual install" developer doc located here:

http://docs.openstack.org/developer/trove/dev/manual_install.html

did not indicate that you need swift for backups.

I added the swift info.

Change-Id: I23e8565aee7e7036e4e6065e2c22f568e65ca7a7
Closes-Bug: #1342273
Use auth_token from keystonemiddleware

auth_token middleware in python-keystoneclient is deprecated and has
been moved to the keystonemiddleware repo.

Change-Id: Ib43223c2cfb31198b9438bb02f0d68f2bab7eb7e
Closes-Bug: #1342274
Merge "Manual install page needed swift info"