Compare configured ICE servers against the gathered candidates.
For each configured ICE server URL, determine which candidates it
produced (by matching the server's URL to the candidate's url field
with credential/transport-suffix normalization). Flag servers that
returned no candidates, and detect strict networks (configured
STUN/TURN UDP but only TURN TCP candidates gathered).
Compare configured ICE servers against the gathered candidates.
For each configured ICE server URL, determine which candidates it produced (by matching the server's URL to the candidate's
urlfield with credential/transport-suffix normalization). Flag servers that returned no candidates, and detect strict networks (configured STUN/TURN UDP but only TURN TCP candidates gathered).