Add support for creating vfat and iso images

This commit introduces support for creating vfat images
and iso images in ironic. Vfat images will be used for
passing information to baremetal node using virtual
media through OOB channel. Iso images will be used for
booting up baremetal nodes via virtual media.

Change-Id: I42b88da02090aec310f567642d3174d0f482b585
Implements: blueprint ironic-ilo-virtualmedia-driver
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