Use the print function

In Python 3, `print` is no longer a statement. Call it as a function
everywhere, and include the future import to remove the statement
in Python 2 code as well.

Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipalib/x509.py

@@ -31,6 +31,8 @@
 # nsscert: the certificate is an NSS Certificate object
 # rawcert: the cert is in an unknown format
 
+from __future__ import print_function
+
 import os
 import sys
 import base64
@@ -407,4 +409,4 @@ if __name__ == '__main__':
 
     nsscert = load_certificate(cert)
 
-    print nsscert
+    print(nsscert)