Add new rescue compute feature flag

This adds a new feature flag to toggle whether rescue mode is supported by
the hypervisor and skips rescue tests accordingly.  The feature is enabled by
default.

Change-Id: I4dabe663a177aac853ea0e6f4b58b28da890be71
Closes-bug: #1331870.

etc/tempest.conf.sample

@@ -424,6 +424,10 @@
 # as [nova.rdp]->enabled in nova.conf (boolean value)
 #rdp_console=false
 
+# Does the test environment support instance rescue mode?
+# (boolean value)
+#rescue=true
+
 
 [dashboard]
 

tempest/api/compute/servers/test_server_rescue.py

@@ -15,14 +15,21 @@
 
 from tempest.api.compute import base
 from tempest.common.utils import data_utils
+from tempest import config
 from tempest import test
 
+CONF = config.CONF
+
 
 class ServerRescueTestJSON(base.BaseV2ComputeTest):
 
     @classmethod
     @test.safe_setup
     def setUpClass(cls):
+        if not CONF.compute_feature_enabled.rescue:
+            msg = "Server rescue not available."
+            raise cls.skipException(msg)
+
         cls.set_network_resources(network=True, subnet=True, router=True)
         super(ServerRescueTestJSON, cls).setUpClass()
 

tempest/api/compute/servers/test_server_rescue_negative.py

@@ -28,6 +28,10 @@ class ServerRescueNegativeTestJSON(base.BaseV2ComputeTest):
     @classmethod
     @test.safe_setup
     def setUpClass(cls):
+        if not CONF.compute_feature_enabled.rescue:
+            msg = "Server rescue not available."
+            raise cls.skipException(msg)
+
         cls.set_network_resources(network=True, subnet=True, router=True)
         super(ServerRescueNegativeTestJSON, cls).setUpClass()
         cls.device = 'vdf'

tempest/api/compute/v3/servers/test_server_rescue.py

@@ -14,13 +14,19 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest import config
 from tempest import test
 
+CONF = config.CONF
+
 
 class ServerRescueV3Test(base.BaseV3ComputeTest):
 
     @classmethod
     def setUpClass(cls):
+        if not CONF.compute_feature_enabled.rescue:
+            msg = "Server rescue not available."
+            raise cls.skipException(msg)
         super(ServerRescueV3Test, cls).setUpClass()
 
         # Server for positive tests

tempest/api/compute/v3/servers/test_server_rescue_negative.py

@@ -28,6 +28,10 @@ class ServerRescueNegativeV3Test(base.BaseV3ComputeTest):
     @classmethod
     @test.safe_setup
     def setUpClass(cls):
+        if not CONF.compute_feature_enabled.rescue:
+            msg = "Server rescue not available."
+            raise cls.skipException(msg)
+
         super(ServerRescueNegativeV3Test, cls).setUpClass()
         cls.device = 'vdf'
 

tempest/config.py

@@ -310,7 +310,11 @@ ComputeFeaturesGroup = [
     cfg.BoolOpt('rdp_console',
                 default=False,
                 help='Enable RDP console. This configuration value should '
-                     'be same as [nova.rdp]->enabled in nova.conf')
+                     'be same as [nova.rdp]->enabled in nova.conf'),
+    cfg.BoolOpt('rescue',
+                default=True,
+                help='Does the test environment support instance rescue '
+                     'mode?')
 ]