fix(rhel): Fix network ordering in upstream cloud-init

1. NM_CONTROLLED=true should be set to allow cloud-init to wait until network
   devices are online.
2. RHEL derivatives should be using the NetworkManager renderer, so set that
   in the default config.

cloudinit/net/sysconfig.py

@@ -317,7 +317,6 @@ class Renderer(renderer.Renderer):
         "rhel": {
             "ONBOOT": True,
             "USERCTL": False,
-            "NM_CONTROLLED": False,
             "BOOTPROTO": "none",
         },
         "suse": {"BOOTPROTO": "static", "STARTMODE": "auto"},

config/cloud.cfg.tmpl

@@ -308,7 +308,7 @@ system_info:
     activators: ['netplan', 'eni', 'network-manager', 'networkd']
 {% elif is_rhel %}
   network:
-    renderers: ['sysconfig', 'eni', 'netplan', 'network-manager', 'networkd']
+    renderers: ['eni', 'netplan', 'network-manager', 'sysconfig', 'networkd']
 {% endif %}
 {% if variant == "photon" %}
   # If set to true, cloud-init will not use fallback network config.