[webrtc-dscp-exp] Move wpt tests to new directory (#8)

alvestrand has just created a new issue for https://github.com/w3c/webrtc-dscp-exp:

== Move wpt tests to new directory ==
By the principles of wpt test naming, tests that reference "priority" should now be in a new webrtc-dscp-exp directory.

(which brings to mind: should we rename this spec "webrtc-priority"?)


Please view or discuss this issue at https://github.com/w3c/webrtc-dscp-exp/issues/8 using your GitHub account