Fix DEPRECATION in stack_tests.rb

[ioggstream]

trafficstars

I expect

the test use the last interface

Instead I get

.[fog][DEPRECATION] #create_stack(stack_name, options) is deprecated, use #create_stack(options) instead (/code/test/requests/orchestration/stack_tests.rb:47:in `block (3 levels) in <top (required)>')
.[fog][DEPRECATION] #update_stack(stack_id, stack_name, options) is deprecated, use #update_stack(stack, options) instead (/code/test/requests/orchestration/stack_tests.rb:59:in `block (3 levels) in <top (required)>')
..[fog][DEPRECATION] #delete_stack(stack_name, stack_id) is deprecated, use #delete_stack(stack) instead (/code/test/requests/orchestration/stack_tests.rb:67:in `block (3 levels) in <top (required)>')