Nova API returning HTTP response code 202 instead the response 204 for keypair-delete

Issue

Upon deletion of a key-pair with nova API, the API returns a 202 status code as below:

 nova --debug keypair-delete test
(...)
DEBUG (session:224) RESP: [202] date: Fri, 29 Jul 2016 23:41:58 GMT content-length: 0 content-type: text/html; charset=UTF-8 x-compute-request-id: req-2221a072-c0d7-48f9-8881-423cb88819f6

However, according to standard usage, instead of a HTTP 202 Accepted, nova ideally should return a HTTP 204 No Content.