Made mx_rt and rt_number as str so that they can be treated

in the same way when testbed.py was used.

Change-Id: I7270ef27af25dcb51051d09c6445510f9eef2640
Closes-bug: #1763290

common/contrail_test_init.py

@@ -837,8 +837,8 @@ def parse_yml_file(self):
         self.fip_pool = test_configs.get('public_subnet')
         self.fip_pool_name = test_configs.get('fip_pool_name')
         self.public_tenant = test_configs.get('public_tenant_name')
-        self.mx_rt = test_configs.get('public_rt')
-        self.router_asn = test_configs.get('router_asn') or '64512'
+        self.mx_rt = str(test_configs.get('public_rt') or '')
+        self.router_asn = str(test_configs.get('router_asn') or '64512')
         self.kube_config_file = test_configs.get('kube_config_file') or '/etc/kubernetes/admin.conf'
         self.ext_routers = []
         for rtr_name, address in test_configs.get('ext_routers', {}).iteritems():