Add support for interacting with swift

This commit introduces support for interacting with
swift for creating and deleting swift objects. This
will be initially used by ilo driver for hosting
temporary floppy images.

Change-Id: I9a3962820b7e18fb1014be1e43cb107facfede9f
Implements: blueprint ironic-ilo-virtualmedia-driver
IloVirtualMediaIscsi deploy driver

This commit introduces a new deploy driver which uses iLO virtual
media to boot up proliant baremetal nodes, and uses iSCSI to deploy
the baremetal nodes.

Change-Id: I98f47ed6082a3a28fce3148f6d5177cdb5c61881