Fix default route with libnl3.8+

Since libnl3.8, he nl_addr_parse does not return 'none' anymore for
'default', but it returns a 0.0.0.0/0 addr.
thom311/libnl@0c0aee8

But since we depend on that value in vdsm, it never reported a default
gateway anymore, and caused networks to be out of sync.

So next to 'none' we also check for '0.0.0.0/0' or '::/0'.

Signed-off-by: Jean-Louis Dupond <jean-louis@dupond.be>

lib/vdsm/network/netinfo/routes.py

@@ -53,7 +53,9 @@ def is_default_route(gateway, routes):
             and route['family'] == 'inet'
             and route['scope'] == 'global'
             and route['gateway'] == gateway
-            and route['destination'] == 'none'
+            and (route['destination'] == 'none'
+                 or route['destination'] == '0.0.0.0/0'
+                 or route['destination'] == '::/0')
         ):
             return True
     return False
@@ -83,7 +85,8 @@ def get_gateway(
     gateways = [
         r
         for r in routes
-        if r['destination'] == 'none'
+        if (r['destination'] == 'none' or r['destination'] == '0.0.0.0/0'
+            or r['destination'] == '::/0')
         and (r.get('table') == table or table == RtKnownTables.RT_TABLE_UNSPEC)
         and r['scope'] == 'global'
         and r['family'] == ('inet6' if family == 6 else 'inet')