Add nova migration-list CLI test

Change-Id: I22b49ee3244ff1c05a0041f0d8a5719824617b68
diff --git a/tempest/cli/simple_read_only/test_nova.py b/tempest/cli/simple_read_only/test_nova.py
index b0264d0..62b4831 100644
--- a/tempest/cli/simple_read_only/test_nova.py
+++ b/tempest/cli/simple_read_only/test_nova.py
@@ -176,6 +176,10 @@
         self.nova('agent-list')
         self.nova('agent-list', flags='--debug')
 
+    def test_migration_list(self):
+        self.nova('migration-list')
+        self.nova('migration-list', flags='--debug')
+
     # Optional arguments:
 
     def test_admin_version(self):