junos_config: Remove reliance on ability to output configuration in set format (#23225)

* Remove reliance on ability to output configuration in `set` format
* Support multiple warnings per rpc-reply

lib/ansible/module_utils/netconf.py

@@ -31,13 +31,31 @@ from xml.etree.ElementTree import tostring, fromstring
 
 from ansible.module_utils.connection import exec_command
 
+
+NS_MAP = {'nc': "urn:ietf:params:xml:ns:netconf:base:1.0"}
+
 def send_request(module, obj, check_rc=True):
     request = tostring(obj)
     rc, out, err = exec_command(module, request)
-    if rc != 0:
-        if check_rc:
+    if rc != 0 and check_rc:
+        error_root = fromstring(err)
+        fake_parent = Element('root')
+        fake_parent.append(error_root)
+
+        error_list = fake_parent.findall('.//nc:rpc-error', NS_MAP)
+        if not error_list:
             module.fail_json(msg=str(err))
-        return fromstring(out)
+
+        warnings = []
+        for rpc_error in error_list:
+            message = rpc_error.find('./nc:error-message', NS_MAP).text
+            severity = rpc_error.find('./nc:error-severity', NS_MAP).text
+
+            if severity == 'warning':
+                warnings.append(message)
+            else:
+                module.fail_json(msg=str(err))
+        return warnings
     return fromstring(out)
 
 def children(root, iterable):