fix compatibility with old python versions

libtisbackup/backup_xva.py

@@ -35,6 +35,8 @@ import tarfile
 import hashlib
 from stat import *
 import ssl  
+
+if hasattr(ssl, '_create_unverified_context'): 
     ssl._create_default_https_context = ssl._create_unverified_context
 
 

libtisbackup/copy_vm_xcp.py

@@ -34,6 +34,7 @@ import base64
 import socket
 from stat import *
 import ssl  
+if hasattr(ssl, '_create_unverified_context'): 
     ssl._create_default_https_context = ssl._create_unverified_context