generator/host: Refactor OS detection

generate-icinga-generic-host.py

@@ -219,33 +219,23 @@ def create_icinga2_host_object_from_netbox(netbox, device_name):
                 continue
             ssh_ports.append(p)
 
-    device_is_linux = False
+    os = None
     if device.platform:
         device_platform = device.platform.slug
         for linux_platform in LINUX_PLATFORMS:
             if device_platform == linux_platform:
-                device_is_linux = True
+                os = "Linux"
                 break
 
-    if device_is_linux:
-        host = Icinga2Host(
-                device_name,
-                "server",
-                parent,
-                primary_ip4,
-                primary_ip6,
-                ssh_port,
-                "Linux"
-                )
-    else:
-        host = Icinga2Host(
-                device_name,
-                "server",
-                parent,
-                primary_ip4,
-                primary_ip6,
-                ssh_port
-                )
+    host = Icinga2Host(
+            device_name,
+            "server",
+            parent,
+            primary_ip4,
+            primary_ip6,
+            ssh_port,
+            os
+            )
 
     if device.device_role.slug == "vm-host":
         host.host_class = "vm-host"