Description of problem:
API delete nonexisting upload_id returns 200, checked on 2.4.4 and 2.6 for empty and non empty upload_id list


Version-Release number of selected component (if applicable):
>> rpm -qa | grep pulp-server
pulp-server-2.6.0-0.1.alpha.el7.noarch

How reproducible:
always

Steps to Reproduce:
>> curl -k -X GET https://user:pass@localhost/pulp/api/v2/content/uploads/

{"upload_ids": []}


>> curl -i -H \"Accept: application/json\" -X DELETE -k -u user:pass 'https://host/pulp/api/v2/content/uploads/b5467f02-8b59-4100-ad21-443905300ea2/'

curl: (6) Could not resolve host: application; Name or service not known
HTTP/1.1 200 OK
Date: Thu, 11 Dec 2014 15:26:35 GMT
Server: Apache/2.4.6 (Red Hat) OpenSSL/1.0.1e-fips mod_wsgi/3.4 Python/2.7.5
Content-Length: 4
Content-Type: application/json

null

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another host: 

>> rpm -qa | grep pulp-server
pulp-server-2.4.4-0.1.beta.el7.noarch

>> curl -k -X GET https://user:pass@localhost/pulp/api/v2/content/uploads/


{"upload_ids": ["01f417c9-e25e-492e-baba-a60967d8882d"]}

>> curl -i -H \"Accept: application/json\" -X DELETE -k -u user:pass 'https://localhost/pulp/api/v2/content/uploads/b5467f02-8b59-4100-ad21-443905300ea2/'

curl: (6) Could not resolve host: application; Name or service not known
HTTP/1.1 200 OK
Date: Thu, 11 Dec 2014 15:33:51 GMT
Server: Apache/2.4.6 (Red Hat) OpenSSL/1.0.1e-fips mod_wsgi/3.4 Python/2.7.5
Content-Length: 4
Content-Type: application/json



Expected results:
404 as in docs https://pulp-dev-guide.readthedocs.org/en/latest/integration/rest-api/content/upload.html#delete-an-upload-request