Potential incorrect WPS-1 service ACL permissions validation

[fmigneault]

see crim-ca/weaver#22 for use case

• Verify that POST for WPS-1 request=Execute doesn't cause problem (when using XML body instead of DataInputs=... in URI with GET request). When request has XML body, the values inside it are used instead of identifier=...&request=... in the URI. Therefore, the ServiceWPS possibly fails to retrieve the actual request field, and then fails to retrieve the proper ACL for Twitcher.
• verify that WPS-1 request=... to corresponding Magpie service permission mapping is properly accomplished so that access to corresponding requests is granted/blocked as expected.