Update replication property in capabilities

Our current standard capabilities are reporting the nonexistent
"replication" property to the scheduler, and this is then exposed to the
users via the "get_capabilities" REST API.

Currently users will see a "replication" property defined as:

  {u'type': u'boolean',
   u'description': u'Enables replication.',
   u'title': u'Replication'}

And while the definition is correct, the name of the property isn't,
since replication v2.1 uses "replication_enabled" instead, which defeats
the whole purpose of reporting the standard properties.

This patch updates the reported name so it matches existing
implementation.

Closes-Bug: #1642403
Change-Id: Ia39c24d1b256fb3b1d1ee2f1a8c47a04dbb1c3b7

cinder/tests/unit/test_volume.py

@@ -4526,7 +4526,7 @@ class VolumeTestCase(base.BaseVolumeTestCase):
                 'title': 'QoS',
                 'description': 'Enables QoS.',
                 'type': 'boolean'},
-            'replication': {
+            'replication_enabled': {
                 'title': 'Replication',
                 'description': 'Enables replication.',
                 'type': 'boolean'},

cinder/volume/driver.py

@@ -625,7 +625,7 @@ class BaseVD(object):
 
         self._set_property(
             properties,
-            "replication",
+            "replication_enabled",
             "Replication",
             _("Enables replication."),
             "boolean")