bug/1270114. Missing documentation for Bulk Middleware.
bug/1270114. Missing documentation for Bulk Middleware.

Closes-Bug: #1270114

This patch addresses the missing bulk middleware documentation for
the following bug:

https://bugs.launchpad.net/swift/+bug/1270114

And feature:

https://review.openstack.org/#/c/176161/

The documentation will show under:

http://docs.openstack.org/developer/swift/middleware.html

Change-Id: I73c101e09830d7120b5e5c1333ae8d570a9e2303

clayg/swift,redbo/swift,smerritt/swift,psachin/swift,daasbank/swift,tipabu/swift,williamthegrey/swift,smerritt/swift,revoer/keystone-8.0.0,hurricanerix/swift,matthewoliver/swift,smerritt/swift,notmyname/swift,openstack/swift,psachin/swift,rackerlabs/swift,williamthegrey/swift,larsbutler/swift,notmyname/swift,larsbutler/swift,psachin/swift,swiftstack/swift,matthewoliver/swift,redbo/swift,smerritt/swift,clayg/swift,hurricanerix/swift,hurricanerix/swift,bkolli/swift,rackerlabs/swift,tipabu/swift,clayg/swift,notmyname/swift,tipabu/swift,psachin/swift,aerwin3/swift,openstack/swift,openstack/swift,daasbank/swift,thiagodasilva/swift,bkolli/swift,prashanthpai/swift,notmyname/swift,hurricanerix/swift,nadeemsyed/swift,nadeemsyed/swift,swiftstack/swift,matthewoliver/swift,openstack/swift,aerwin3/swift,prashanthpai/swift,tipabu/swift,matthewoliver/swift,swiftstack/swift,clayg/swift,levythu/swift,thiagodasilva/swift,levythu/swift,revoer/keystone-8.0.0,nadeemsyed/swift,nadeemsyed/swift