Fix unicode handling in connection plugins.

lib/ansible/plugins/action/fetch.py

@@ -25,6 +25,7 @@ from ansible.plugins.action import ActionBase
 from ansible.utils.boolean import boolean
 from ansible.utils.hashing import checksum, checksum_s, md5, secure_hash
 from ansible.utils.path import makedirs_safe
+from ansible.utils.unicode import to_bytes
 
 
 class ActionModule(ActionBase):
@@ -158,7 +159,7 @@ class ActionModule(ActionBase):
                 self._connection.fetch_file(source, dest)
             else:
                 try:
-                    f = open(dest, 'w')
+                    f = open(to_bytes(dest, errors='strict'), 'w')
                     f.write(remote_data)
                     f.close()
                 except (IOError, OSError) as e: