Replace deprecated tenant_id property

The tenant_id property of RestClient in tempest was deprecated in
25.0.0. This replaces the deprecated property by the new project_id
property to avoid the following warning.

WARNING tempest.lib.common.rest_client [-] Deprecated: "tenant_id"
property is deprecated for removal, use "project_id" instead

Depends-on: https://review.opendev.org/c/openstack/tempest/+/707938
Change-Id: Ie3c32f9f2278b78603a4214c5717df8691ba490a
diff --git a/neutron_tempest_plugin/api/test_routers.py b/neutron_tempest_plugin/api/test_routers.py
index 5e916f5..4179e6d 100644
--- a/neutron_tempest_plugin/api/test_routers.py
+++ b/neutron_tempest_plugin/api/test_routers.py
@@ -316,7 +316,7 @@
     @decorators.idempotent_id('644d7a4a-01a1-4b68-bb8d-0c0042cb1729')
     def test_convert_distributed_router_back_to_centralized(self):
         # Convert a centralized router to distributed firstly
-        router_args = {'tenant_id': self.client.tenant_id,
+        router_args = {'tenant_id': self.client.project_id,
                        'distributed': False, 'ha': False}
         router = self._create_admin_router(
             data_utils.rand_name('router'), admin_state_up=False,
@@ -348,7 +348,7 @@
 
     @decorators.idempotent_id('0ffb9973-0c1a-4b76-a1f2-060178057661')
     def test_convert_centralized_router_to_distributed_extended(self):
-        router_args = {'tenant_id': self.client.tenant_id,
+        router_args = {'tenant_id': self.client.project_id,
                        'distributed': False, 'ha': False}
         router = self._create_admin_router(
             data_utils.rand_name('router'), admin_state_up=True,
@@ -371,7 +371,7 @@
 
     @decorators.idempotent_id('e9a8f55b-c535-44b7-8b0a-20af6a7c2921')
     def test_convert_distributed_router_to_centralized_extended(self):
-        router_args = {'tenant_id': self.client.tenant_id,
+        router_args = {'tenant_id': self.client.project_id,
                        'distributed': True, 'ha': False}
         router = self._create_admin_router(
             data_utils.rand_name('router'), admin_state_up=True,