Update warning log to use log_deprecation

Update config handling to support `api_services` config outside of `keys` since #98 enabled more configuration options

neon_api_proxy/controller.py

@@ -27,7 +27,7 @@
 # SOFTWARE,  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 from os.path import join, isfile
-from ovos_utils.log import LOG
+from ovos_utils.log import LOG, log_deprecation
 from ovos_config.config import Configuration
 from neon_utils.configuration_utils import NGIConfig
 from ovos_config.locations import get_xdg_config_save_path
@@ -70,10 +70,14 @@ def _init_config() -> dict:
         legacy_config_file = join(get_xdg_config_save_path(),
                                   "ngi_auth_vars.yml")
         if isfile(legacy_config_file):
-            LOG.warning(f"Legacy configuration found at: {legacy_config_file}")
+            log_deprecation(f"Legacy configuration found at: {legacy_config_file}. "
+                            f"This will be ignored in future versions.",
+                            "1.0.0")
             return NGIConfig("ngi_auth_vars").get("api_services") or dict()
         else:
-            return Configuration().get("keys", {}).get("api_services") or dict()
+            config = Configuration()
+            return config.get("keys", {}).get("api_services") or \
+                config.get("api_services") or dict()
 
     def init_service_instances(self, service_class_mapping: dict) -> dict:
         """