Fix to delete vsx-sync from vlan

When is assignin "False" to delete vsx-sync from vlan, the
configuration was not made. This commit fixes this behavior, which
changes the way to validate the existence of the attribute.

AOSANSI 268651

Change-Id: Ieed8ed1d56b4bcd3effb5a2cd74d25eaaebf7427
(cherry picked from commit f846025a3fbde2e6f593423ac2ff58f16bd6013a)

pyaoscx/vlan.py

@@ -205,7 +205,7 @@ def update(self):
         """
 
         vlan_data = utils.get_attrs(self, self.config_attrs)
-        if self.vsx_sync:
+        if self.vsx_sync is not None:
             vlan_data["vsx_sync"] = self.vsx_sync
         if hasattr(self, "voice"):
             vlan_data["voice"] = self.voice
@@ -238,7 +238,7 @@ def create(self):
 
         # Get all VLAN data given by the user
         vlan_data = utils.get_attrs(self, self.config_attrs)
-        if self.vsx_sync:
+        if self.vsx_sync is not None:
             vlan_data["vsx_sync"] = self.vsx_sync
         if hasattr(self, "voice"):
             vlan_data["voice"] = self.voice