Add some test_cases for compute-cli

+ test_agent_list
+ test_cell_list
+ test_host_list

Change-Id: Ic99c3e137da688a97d39af4902c71ddddf34228e
diff --git a/tempest/cli/simple_read_only/test_compute.py b/tempest/cli/simple_read_only/test_compute.py
index 9b358e6..94415f0 100644
--- a/tempest/cli/simple_read_only/test_compute.py
+++ b/tempest/cli/simple_read_only/test_compute.py
@@ -167,6 +167,10 @@
     def test_admin_net_list(self):
         self.nova('net-list')
 
+    def test_agent_list(self):
+        self.nova('agent-list')
+        self.nova('agent-list', flags='--debug')
+
     # Optional arguments:
 
     def test_admin_version(self):
diff --git a/tempest/cli/simple_read_only/test_compute_manage.py b/tempest/cli/simple_read_only/test_compute_manage.py
index 523c65f..9a33556 100644
--- a/tempest/cli/simple_read_only/test_compute_manage.py
+++ b/tempest/cli/simple_read_only/test_compute_manage.py
@@ -81,3 +81,11 @@
 
     def test_db_version(self):
         self.assertNotEqual("", self.nova_manage('db version'))
+
+    def test_cell_list(self):
+        # make sure command doesn't error out
+        self.nova_manage('cell list')
+
+    def test_host_list(self):
+        # make sure command doesn't error out
+        self.nova_manage('host list')