Considering we don't care about the accept or content-type
headers for delete calls. This change allows for someone to use
whatever accept header for delete calls to orders and containers
by adding the allow_all_content_type decorator. This provides
better compatiblity across REST clients as some automatically
add the Accept application/json header to their calls. In
addition, this sets add the accept application/json header to
our functional tests. If we're testing how the app handles
headers, then those should be specific tests.
Change-Id: I7fb4ba7c30ade9a5d4392d85b1a367987c851752
a9eb91823d