updates naming for built in config services, broke out current example script to examples dir, broke out config service manager to separate file

daemon/core/configservice/manager.py

@@ -0,0 +1,48 @@
+import logging
+import pathlib
+from typing import List
+
+from core import utils
+from core.configservice.base import ConfigService
+from core.errors import CoreError
+
+
+class ConfigServiceManager:
+    def __init__(self):
+        self.services = {}
+
+    def add(self, service: ConfigService) -> None:
+        name = service.name
+        logging.debug("loading service: class(%s) name(%s)", service.__class__, name)
+
+        # avoid duplicate services
+        if name in self.services:
+            raise CoreError(f"duplicate service being added: {name}")
+
+        # validate dependent executables are present
+        for executable in service.executables:
+            try:
+                utils.which(executable, required=True)
+            except ValueError:
+                raise CoreError(
+                    f"service({service.name}) missing executable {executable}"
+                )
+
+            # make service available
+        self.services[name] = service
+
+    def load(self, path: str) -> List[str]:
+        path = pathlib.Path(path)
+        subdirs = [x for x in path.iterdir() if x.is_dir()]
+        service_errors = []
+        for subdir in subdirs:
+            logging.info("loading config services from: %s", subdir)
+            services = utils.load_classes(str(subdir), ConfigService)
+            for service in services:
+                logging.info("found service: %s", service)
+                try:
+                    self.add(service)
+                except CoreError as e:
+                    service_errors.append(service.name)
+                    logging.debug("not loading service(%s): %s", service.name, e)
+        return service_errors