[Feature] added overwrite flag to keyvault command

Author: a0pujara

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

@@ -1460,9 +1460,9 @@ def update_key_rotation_policy(cmd, client, value, key_name=None):
 
 
 # region KeyVault Secret
-def download_secret(client, file_path, name=None, encoding=None, version=''):  # pylint: disable=unused-argument
+def download_secret(client, file_path, name=None, encoding=None, version='', overwrite: bool = False):  # pylint: disable=unused-argument
     """ Download a secret from a KeyVault. """
-    if os.path.isfile(file_path) or os.path.isdir(file_path):
+    if not overwrite and (os.path.isfile(file_path) or os.path.isdir(file_path)):
         raise CLIError("File or directory named '{}' already exists.".format(file_path))
 
     secret = client.get_secret(name, version)