[minigraph.py]: Parse VLAN MAC address from minigraph when present (#5726)

Author: theasianpianist

src/sonic-config-engine/minigraph.py

@@ -383,6 +383,10 @@ def parse_dpg(dpg, hname):
                 vdhcpserver_list = vintfdhcpservers.split(';')
                 vlan_attributes['dhcp_servers'] = vdhcpserver_list
 
+            vlanmac = vintf.find(str(QName(ns, "MacAddress")))
+            if vlanmac != None:
+                vlan_attributes['mac'] = vlanmac.text
+
             sonic_vlan_name = "Vlan%s" % vlanid
             if sonic_vlan_name != vintfname:
                 vlan_attributes['alias'] = vintfname

src/sonic-config-engine/tests/simple-sample-graph-case.xml

@@ -134,6 +134,7 @@
           <VlanID>1000</VlanID>
           <Tag>1000</Tag>
           <Subnets>192.168.0.0/27</Subnets>
+          <MacAddress>00:aa:bb:cc:dd:ee</MacAddress>
         </VlanInterface>
       </VlanInterfaces>
       <IPInterfaces>

src/sonic-config-engine/tests/test_minigraph_case.py

@@ -83,7 +83,7 @@ def test_minigraph_vlans(self):
         output = self.run_script(argument)
         self.assertEqual(
             utils.to_dict(output.strip()),
-            utils.to_dict("{'Vlan1000': {'alias': 'ab1', 'dhcp_servers': ['192.0.0.1', '192.0.0.2'], 'vlanid': '1000'}}")
+            utils.to_dict("{'Vlan1000': {'alias': 'ab1', 'dhcp_servers': ['192.0.0.1', '192.0.0.2'], 'vlanid': '1000', 'mac': '00:aa:bb:cc:dd:ee' }}")
         )
 
     def test_minigraph_vlan_members(self):