Modernize number literals

Use Python-3 compatible syntax, without breaking compatibility with py 2.7

- Octals literals start with 0o to prevent confusion
- The "L" at the end of large int literals is not required as they use
  long on Python 2 automatically.
- Using 'int' instead of 'long' for small numbers is OK in all cases except
  strict type checking checking, e.g. type(0).

https://fedorahosted.org/freeipa/ticket/4985

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

ipatests/test_xmlrpc/test_dns_plugin.py

@@ -1832,7 +1832,7 @@ class test_dns(Declarative):
 
         dict(
             desc='Set SOA serial of zone %r to high number' % zone1,
-            command=('dnszone_mod', [zone1], {'idnssoaserial': 4294967295L}),
+            command=('dnszone_mod', [zone1], {'idnssoaserial': 4294967295}),
             expected={
                 'value': zone1_absolute_dnsname,
                 'summary': None,