feat: ensure create_hostname_file is added to distro cfg

The new create_hostname_file is necessary for the distro to be aware of.
This change adds create_hostname_file to the cfg distro uses when it
runs cc_set_hostname and cc_update_hostname.

cloudinit/config/cc_set_hostname.py

@@ -96,6 +96,13 @@ def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
     if hostname_fqdn is not None:
         cloud.distro.set_option("prefer_fqdn_over_hostname", hostname_fqdn)
 
+    # Set create_hostname_file in distro
+    create_hostname_file = util.get_cfg_option_bool(
+        cfg, "create_hostname_file", None
+    )
+    if create_hostname_file is not None:
+        cloud.distro.set_option("create_hostname_file", create_hostname_file)
+
     (hostname, fqdn, is_default) = util.get_hostname_fqdn(cfg, cloud)
     # Check for previous successful invocation of set_hostname
 

cloudinit/config/cc_update_hostname.py

@@ -99,6 +99,13 @@ def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
     if hostname_fqdn is not None:
         cloud.distro.set_option("prefer_fqdn_over_hostname", hostname_fqdn)
 
+    # Set create_hostname_file in distro
+    create_hostname_file = util.get_cfg_option_bool(
+        cfg, "create_hostname_file", None
+    )
+    if create_hostname_file is not None:
+        cloud.distro.set_option("create_hostname_file", create_hostname_file)
+
     (hostname, fqdn, is_default) = util.get_hostname_fqdn(cfg, cloud)
     if is_default and hostname == "localhost":
         # https://github.com/systemd/systemd/commit/d39079fcaa05e23540d2b1f0270fa31c22a7e9f1