[topo_t1-64]: Add topo_t1-64.yml to support ptf64 topology (sonic-net#580)

Add lab-s6100-01.t1-64.xml and two entries in testbed.csv file

Signed-off-by: Shuotian Cheng <stcheng_89@hotmail.com>

Author: Shuotian Cheng

ansible/library/topo_facts.py

@@ -29,7 +29,7 @@ def get_topo_config(self, topo_name):
         if 'ptf32' in topo_name:
             topo_name = 't1'
         if 'ptf64' in topo_name:
-            topo_name = 't1-64'  ###TODO: there is no t1-64 topology checked in yet
+            topo_name = 't1-64'
         topo_filename = 'vars/topo_' + topo_name + '.yml'
         vm_topo_config = dict()