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/dynamips_hypervisor.py

@@ -90,12 +90,12 @@ class DynamipsHypervisor:
         if not connection_success:
             raise DynamipsError(f"Couldn't connect to hypervisor on {host}:{self._port} :{last_exception}")
         else:
-            log.info(f"Connected to Dynamips hypervisor on {host}:{self._port} after {time.time() - begin:.4f} seconds")
+            log.debug(f"Connected to Dynamips hypervisor on {host}:{self._port} after {time.time() - begin:.4f} seconds")
 
         try:
             version = await self.send("hypervisor version")
             self._version = version[0].split("-", 1)[0]
-            log.info("Dynamips version {} detected".format(self._version))
+            log.debug("Dynamips version {} detected".format(self._version))
         except IndexError:
             log.warning("Dynamips version could not be detected")
             self._version = "Unknown"