refactored how services are loaded to be more dynamic

daemon/core/services/__init__.py

@@ -4,17 +4,20 @@ Services
 Services available to nodes can be put in this directory.  Everything listed in
 __all__ is automatically loaded by the main core module.
 """
+import os
 
-__all__ = [
-    "quagga",
-    "nrl",
-    "xorp",
-    "bird",
-    "utility",
-    "security",
-    "ucarp",
-    "dockersvc",
-    "OvsService",
-    "RyuService",
-    "startup"
-]
+from core.misc import log
+from core.service import ServiceManager
+
+logger = log.get_logger(__name__)
+
+_PATH = os.path.abspath(os.path.dirname(__file__))
+
+
+def load():
+    """
+    Loads all services from the modules that reside under core.services.
+
+    :return: nothing
+    """
+    ServiceManager.add_services(_PATH)