First approximation of an 'apply' command, using cli_inband() for now

vppcfg/vppcfg.py

@@ -29,6 +29,7 @@ except ModuleNotFoundError:
     sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
     from vppcfg.config import Validator
     from vppcfg._version import __version__
+from vppcfg.vpp.applier import Applier
 from vppcfg.vpp.planner import Planner
 from vppcfg.vpp.dumper import Dumper
 
@@ -301,6 +302,13 @@ def main():
     if args.command == "plan":
         sys.exit(0)
 
+    if args.command == "apply":
+        applier = Applier(cfg, planner.get_commands())
+        if not applier.apply():
+            logging.error("Applying configuration failed")
+            sys.exit(-50)
+        logging.info("Apply succeeded")
+
     sys.exit(0)