fixes issue when netconf would report ios is not supported (ansible#3…

…8155)

* fixes issue when netconf would report ios is not supported

This change now will map ansible_network_os=ios to the correct netconf
plugin implementation.  This will resolve an error where the netconf
connection plugin will report that ios is unsupported.

(cherry picked from commit 91a748e)

lib/ansible/plugins/connection/netconf.py

@@ -157,8 +157,9 @@
 
 logging.getLogger('ncclient').setLevel(logging.INFO)
 
-network_os_device_param_map = {
-    "nxos": "nexus"
+NETWORK_OS_DEVICE_PARAM_MAP = {
+    "nxos": "nexus",
+    "ios": "default"
 }
 
 
@@ -242,7 +243,7 @@ def _connect(self):
                 if network_os:
                     display.display('discovered network_os %s' % network_os, log_only=True)
 
-        device_params = {'name': (network_os_device_param_map.get(network_os) or network_os or 'default')}
+        device_params = {'name': (NETWORK_OS_DEVICE_PARAM_MAP.get(network_os) or network_os or 'default')}
 
         ssh_config = os.getenv('ANSIBLE_NETCONF_SSH_CONFIG', False)
         if ssh_config in BOOLEANS_TRUE: