- add bulk delete functionality

[thomasritscher]

Add bulk delete functionality to delete several objects / containers in one call. -> implemented according to: https://docs.openstack.org/ocata/user-guide/cli-swift-bulk-delete.html

• use ObjectIdentifier to specify containers / objects
• deserialize result as BulkDeleteResponse
• extended Mock environment

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DCO 1.1 Signed-off-by: Thomas Ritscher

[ferrys]

Fix for issue #127

[ferrys]

Hi @thomasritscher, could you please add tests for this functionality?