[Network] az network dns zone import: --zone-name will be case insensitive in the future. (#12264)

Author: mmyyrroonn

src/azure-cli/azure/cli/command_modules/network/custom.py

@@ -1668,6 +1668,7 @@ def _build_record(cmd, data):
 def import_zone(cmd, resource_group_name, zone_name, file_name):
     from azure.cli.core.util import read_file_content
     import sys
+    logger.warning("In the future, zone name will be case insensitive.")
     RecordSet = cmd.get_models('RecordSet', resource_type=ResourceType.MGMT_NETWORK_DNS)
 
     file_text = read_file_content(file_name)