swift as glance backend (#2)

* Add swift to mitaka glance configuration

* Revert "Add swift to mitaka glance configuration"

This reverts commit 4fdd899db23cdb9e26c158b74397ede79495a136.

* Added swift configuration to formula

* Update configuration with new variables and defaults

* Adding a swift test example with lots of configuration options.

* Add sample for swift in README

* remove empty else.

* Adding endif for if 'swift' in storage_engines.

* Update variable naming scheme to use swift.store instead of swift_store
3 files changed