Get token for admin client with static accounts

Closes-Bug: PRODX-26560
Change-Id: Ie055c3479c1695cd2b2ac0df650aa2676019de3b
(cherry picked from commit 182e06da6e2404a7a65972d047572b4616945599)
(cherry picked from commit 60d02911fa0b04a318f66cf59944c3ff7cf6ec4f)
diff --git a/neutron_tempest_plugin/api/base.py b/neutron_tempest_plugin/api/base.py
index db84a7c..a0ff1f1 100644
--- a/neutron_tempest_plugin/api/base.py
+++ b/neutron_tempest_plugin/api/base.py
@@ -1234,6 +1234,7 @@
     def setup_clients(cls):
         super(BaseAdminNetworkTest, cls).setup_clients()
         cls.admin_client = cls.os_admin.network_client
+        cls.admin_client.auth_provider.get_token()
         cls.identity_admin_client = cls.os_admin.projects_client
 
     @classmethod