Use staging provisioning server

Merge from Widevine repo of http://go/wvgerrit/94067

The android tests should use the staging provisioning server until
production is able to support core messages.

Test: ran WvCdmRequestLicenseTest.ProvisioningTest with v16 mod mock
Bug: 149622735
Change-Id: I4ec0cc8e8474dc4250e092473fef90d7358260de

libwvdrmengine/cdm/core/test/config_test_env.cpp

@@ -279,6 +279,9 @@ const ConfigTestEnv::LicenseServerConfiguration license_servers[] = {
 
 }  // namespace
 
+const std::string kDefaultProvisioningServerUrl =
+    kCpProductionProvisioningServerUrl;
+
 ConfigTestEnv::ConfigTestEnv(ServerConfigurationId server_id) {
   Init(server_id);
 }

libwvdrmengine/cdm/core/test/config_test_env.h

@@ -118,6 +118,9 @@ class ConfigTestEnv {
   std::string provisioning_service_certificate_;
 };
 
+// The default provisioning server URL for a default provisioning request.
+extern const std::string kDefaultProvisioningServerUrl;
+
 }  // namespace wvcdm
 
 #endif  // CDM_TEST_CONFIG_TEST_ENV_H_