log: demote all per-node lifecycle INFO logs to DEBUG

Extend the docker_vm / base_node demotion to the remaining node types
and supporting layers:

  qemu_vm: MAC, adapters, disk image, RAM, priority, NIO added, created
  iou_vm:  application ID, adapters, serial, image, RAM, NIO added
  dynamips router: created, adapter, RAM, NVRAM, IOS, idle-PC, disk,
    MAC, NIO bound; hypervisor create/start/connect; nio_udp created
  builtin: ethernet_switch/hub, cloud, nat — created, NIO bound
  ubridge: hypervisor start/connect

At multi-node scale these per-node lines flood the log. Only the
project-open progress summary (loaded N nodes / creating N links)
now remains at INFO alongside genuinely exceptional events.

gns3server/compute/dynamips/__init__.py

@@ -333,9 +333,9 @@ class Dynamips(BaseManager):
         port_manager = PortManager.instance()
         hypervisor = Hypervisor(self._dynamips_path, working_dir, server_host, port, port_manager.console_host, bind_console_host)
 
-        log.info(f"Creating new hypervisor {hypervisor.host}:{hypervisor.port} with working directory {working_dir}")
+        log.debug(f"Creating new hypervisor {hypervisor.host}:{hypervisor.port} with working directory {working_dir}")
         await hypervisor.start()
-        log.info(f"Hypervisor {hypervisor.host}:{hypervisor.port} has successfully started")
+        log.debug(f"Hypervisor {hypervisor.host}:{hypervisor.port} has successfully started")
         await hypervisor.connect()
         return hypervisor
 
@@ -555,7 +555,7 @@ class Dynamips(BaseManager):
         :returns: relative path to the created config file
         """
 
-        log.info(f"Creating config file {path}")
+        log.debug(f"Creating config file {path}")
         config_dir = os.path.dirname(path)
         try:
             os.makedirs(config_dir, exist_ok=True)