Make Vanilla 2.3.0 plugin deprecated

Change-Id: Ib6b47a5d8ef80646cf32de9c31c4b82e0b323da8

sahara/exceptions.py

@@ -250,3 +250,10 @@ class TimeoutException(SaharaException):
 
     def __init__(self, timeout):
         self.message = self.message % timeout
+
+
+class DeprecatedException(SaharaException):
+    code = "DEPRECATED"
+
+    def __init__(self, message):
+        self.message = message

sahara/plugins/vanilla/v2_3_0/versionhandler.py

@@ -17,6 +17,8 @@ from oslo.config import cfg
 
 from sahara import conductor
 from sahara import context
+from sahara import exceptions as ex
+from sahara.i18n import _
 from sahara.openstack.common import log as logging
 from sahara.plugins.general import utils
 from sahara.plugins.vanilla import abstractversionhandler as avm
@@ -53,7 +55,10 @@ class VersionHandler(avm.AbstractVersionHandler):
         }
 
     def validate(self, cluster):
-        vl.validate_cluster_creating(self.pctx, cluster)
+        raise ex.DeprecatedException(
+            _("The Vanilla 2.3.0 plugin is now deprecated and will be removed"
+              " in the Kylo release. The Vanilla 2.4.1 plugin remains and"
+              " continues to be supported."))
 
     def update_infra(self, cluster):
         pass

sahara/tests/unit/plugins/vanilla/hadoop2/test_validation.py

@@ -84,7 +84,7 @@ class ValidationTest(base.SaharaTestCase):
             lst.append(self.ng[i])
 
         return tu.create_cluster("cluster1", "tenant1", "vanilla",
-                                 "2.3.0", lst, **kwargs)
+                                 "2.4.1", lst, **kwargs)
 
     def _validate_case(self, *args):
         cl = self._create_cluster(*args)