[chassis-packet] Fixed BGP Internal Peer template (#9106)

What I did:

Fix the typo in Internal Peer Group template for Packet-based Chassis.
Address Review comments of PR: [chassis-packet] minigraph parsing and BGP template changes #8966
- Static Route Parsing for Host
- Formatting of chassis port_config.ini

dockers/docker-fpm-frr/frr/bgpd/templates/internal/peer-group.conf.j2

@@ -19,7 +19,7 @@
   exit-address-family
   address-family ipv6
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['switch_type'] == 'chassis-packet' %}
-    neighbor INTERNAL_PEER_V4 update-source {{ get_ipv6_loopback_address(CONFIG_DB__LOOPBACK_INTERFACE, "Loopback4096") | ip }}
+    neighbor INTERNAL_PEER_V6 update-source {{ get_ipv6_loopback_address(CONFIG_DB__LOOPBACK_INTERFACE, "Loopback4096") | ip }}
 {% elif CONFIG_DB__DEVICE_METADATA['localhost']['sub_role'] == 'BackEnd' %}
     neighbor INTERNAL_PEER_V6 route-reflector-client
 {% endif %}

src/sonic-bgpcfgd/tests/data/internal/peer-group.conf/result_chasiss_packet.conf

@@ -11,7 +11,7 @@
     neighbor INTERNAL_PEER_V4 route-map TO_BGP_INTERNAL_PEER_V4 out
   exit-address-family
   address-family ipv6
-    neighbor INTERNAL_PEER_V4 update-source 2603:10e2:400::3 
+    neighbor INTERNAL_PEER_V6 update-source 2603:10e2:400::3 
     neighbor INTERNAL_PEER_V6 soft-reconfiguration inbound
     neighbor INTERNAL_PEER_V6 allowas-in 1
     neighbor INTERNAL_PEER_V6 route-map FROM_BGP_INTERNAL_PEER_V6 in

src/sonic-config-engine/minigraph.py

@@ -279,7 +279,7 @@ def parse_png(png, hname, dpg_ecmp_content = None):
 
                     mux_cable_ports[intf_name] = "true"
 
-        if (len(dpg_ecmp_content)):
+        if dpg_ecmp_content and (len(dpg_ecmp_content)):
             for version, content in dpg_ecmp_content.items():  # version is ipv4 or ipv6
                 fine_grained_content = formulate_fine_grained_ecmp(version, content, port_device_map, port_alias_map)  # port_alias_map
                 FG_NHG_MEMBER.update(fine_grained_content['FG_NHG_MEMBER'])

src/sonic-config-engine/tests/sample-chassis-packet-lc-graph.xml

@@ -105,7 +105,7 @@
       <MplsInterfaces/>
       <MplsTeInterfaces/>
       <RsvpInterfaces/>
-      <Hostname>str2-88</Hostname>
+      <Hostname>str2-8808-lc2-1</Hostname>
       <PortChannelInterfaces>
       </PortChannelInterfaces>
       <IPInterfaces>
@@ -114,7 +114,18 @@
           <AttachTo>Eth1/1/47</AttachTo>
           <Prefix>27.1.1.1/24</Prefix>
         </IPInterface>
-      </IPInterfaces>
+        </IPInterfaces>
+       <VlanInterfaces>
+       </VlanInterfaces>
+      <IPNextHops>
+	   <IPNextHop>
+	    <ElementType>IPNextHop</ElementType>
+	    <Name i:nil="true"/>
+	    <AttachTo>8.0.0.1/32</AttachTo>
+	    <Address>192.168.1.2,192.168.2.2</Address>
+	    <Type>StaticRoute</Type>
+        </IPNextHop>
+      </IPNextHops>
       <DataAcls/>
       <AclInterfaces>
       </AclInterfaces>

src/sonic-config-engine/tests/sample-chassis-packet-lc-port-config.ini

@@ -1,4 +1,4 @@
-# name lanes alias index speed asic_port_name role source_npu target_npu
+# name          lanes                     alias       index speed     asic_port_name role
 Ethernet13      1280,1281,1282,1283       Eth1/1/13   13    100000    Eth13-ASIC1  Ext
 Ethernet14      1284,1285,1286,1287       Eth1/1/14   14    100000    Eth14-ASIC1  Ext
 Ethernet16      1288,1289,1290,1291       Eth1/1/16   16    100000    Eth16-ASIC1  Ext

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

@@ -898,6 +898,13 @@ class TestCfgGen(TestCase):
         )
 
     def test_minigraph_bgp_packet_chassis_static_route(self):
+        argument = '-m "' + self.packet_chassis_graph + '" -p "' + self.packet_chassis_port_ini + '" -v "STATIC_ROUTE"'
+        output = self.run_script(argument)
+        self.assertEqual(
+            utils.to_dict(output.strip()),
+            utils.to_dict("{'8.0.0.1/32': {'nexthop': '192.168.1.2,192.168.2.2'}}")
+        )
+
         argument = '-m "' + self.packet_chassis_graph + '" -p "' + self.packet_chassis_port_ini + '" -n "' + "asic1" + '" -v "STATIC_ROUTE"'
         output = self.run_script(argument)
         self.assertEqual(