[topo file] Fix pt0 announce routes in bgp scale topologies (sonic-net#18686)

What is the motivation for this PR?
In bgp scale test, pt0 should announce vlan routes

How did you do it?
this PR mark pt0 as role tor, and it won't generate routes

How did you verify/test it?
Run ansible script to announce routes on testbed

Author: w1nda

ansible/library/announce_routes.py

@@ -500,6 +500,9 @@ def fib_t0(topo, ptf_ip, no_default_route=False, action="announce"):
 
     vms = topo['topology']['VMs']
     for vm_name, vm in vms.items():
+        router_type = "leaf"
+        if 'tor' in topo['configuration'][vm_name]['properties']:
+            router_type = 'tor'
         vm_offset = vm['vm_offset']
         port = IPV4_BASE_PORT + vm_offset
         port6 = IPV6_BASE_PORT + vm_offset
@@ -512,6 +515,7 @@ def fib_t0(topo, ptf_ip, no_default_route=False, action="announce"):
             routes_v4 = generate_routes("v4", podset_number, tor_number, tor_subnet_number,
                                         spine_asn, leaf_asn_start, tor_asn_start,
                                         nhipv4, nhipv4, tor_subnet_size, max_tor_subnet_number, "t0",
+                                        router_type=router_type,
                                         no_default_route=no_default_route)
             if aggregate_routes_v4:
                 filterout_subnet_ipv4(aggregate_routes, routes_v4)
@@ -521,6 +525,7 @@ def fib_t0(topo, ptf_ip, no_default_route=False, action="announce"):
             routes_v6 = generate_routes("v6", podset_number, tor_number, tor_subnet_number,
                                         spine_asn, leaf_asn_start, tor_asn_start,
                                         nhipv6, nhipv6, tor_subnet_size, max_tor_subnet_number, "t0",
+                                        router_type=router_type,
                                         no_default_route=no_default_route,
                                         ipv6_address_pattern=ipv6_address_pattern)
             if aggregate_routes_v6: