Remove tempest-lib exc Frobidden to Unauthorized translation

This commit removes tempest_lib.exceptions.Forbidden to Unauthorized
translation because it is just a workaround. And, also this commit
removes translation of the tempest-lib exceptions that is workaround
method because it doesn't have any translations anymore. This is the one
of the migrating rest client to tempest-lib works.

Change-Id: If9286d0b326198c391596538d12272c560f1e86d
diff --git a/tempest/api/compute/admin/test_hosts_negative.py b/tempest/api/compute/admin/test_hosts_negative.py
index 3c070ce..1ecd14f 100644
--- a/tempest/api/compute/admin/test_hosts_negative.py
+++ b/tempest/api/compute/admin/test_hosts_negative.py
@@ -40,7 +40,7 @@
     @test.attr(type=['negative', 'gate'])
     @test.idempotent_id('dd032027-0210-4d9c-860e-69b1b8deed5f')
     def test_list_hosts_with_non_admin_user(self):
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.list_hosts)
 
     @test.attr(type=['negative', 'gate'])
@@ -55,7 +55,7 @@
     def test_show_host_detail_with_non_admin_user(self):
         hostname = self._get_host_name()
 
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.show_host_detail,
                           hostname)
 
@@ -64,7 +64,7 @@
     def test_update_host_with_non_admin_user(self):
         hostname = self._get_host_name()
 
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.update_host,
                           hostname,
                           status='enable',
@@ -142,7 +142,7 @@
     def test_startup_host_with_non_admin_user(self):
         hostname = self._get_host_name()
 
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.startup_host,
                           hostname)
 
@@ -160,7 +160,7 @@
     def test_shutdown_host_with_non_admin_user(self):
         hostname = self._get_host_name()
 
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.shutdown_host,
                           hostname)
 
@@ -178,6 +178,6 @@
     def test_reboot_host_with_non_admin_user(self):
         hostname = self._get_host_name()
 
-        self.assertRaises(lib_exc.Unauthorized,
+        self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.reboot_host,
                           hostname)