Use license.widevine.com cert for provisioning server

Merge from Widevine repo of http://go/wvgerrit/44505

This CL changes the certificate provisioning code to verify the
provisioning message using a cert from license.widevine.com instead of
the staging certificate.

It also adjusts the certificates in config_test_env.cpp because the
license and provisioning servers are different and may probably have
different certs.

bug: 73031756
test: unit tests with mock oemcrypto, and read oemcrypto on sailfish
Change-Id: I4b457a369a49ef07bda9e5632ab59e5f621ec966

libwvdrmengine/cdm/core/test/url_request.cpp

@@ -112,7 +112,7 @@ bool UrlRequest::GetResponse(std::string* message) {
   }
 
   ConcatenateChunkedResponse(response, message);
-  LOGV("HTTP response: (%d): %s", message->size(), b2a_hex(*message).c_str());
+  LOGV("HTTP response: (%d): %s", message->size(), message->c_str());
   return true;
 }