fakevirt: return hypervisor_version as an int instead of a string

The compute_nodes.hypervisor_version type in the database is an integer
not a string. This is only caught in postgres and not MySQL. Changing
the fakevirt driver to return the proper type allows for the
test_virt_drivers test to make check this for all drivers it currently
tests.

Change-Id: I25e4dba855b954a2451bced9a53172b51eb47238

nova/tests/virt/test_virt_drivers.py

@@ -573,6 +573,7 @@ class _VirtDriverTestCase(_FakeDriverBackendTestCase):
     def test_get_host_stats(self):
         host_status = self.connection.get_host_stats()
         self._check_available_resouce_fields(host_status)
+        self.assertTrue(isinstance(host_status['hypervisor_version'], int))
 
     @catch_notimplementederror
     def test_get_available_resource(self):

nova/virt/fake.py

@@ -34,6 +34,7 @@ from nova import db
 from nova import exception
 from nova.openstack.common.gettextutils import _
 from nova.openstack.common import log as logging
+from nova import utils
 from nova.virt import driver
 from nova.virt import virtapi
 
@@ -98,7 +99,7 @@ class FakeDriver(driver.ComputeDriver):
           'memory_mb_used': 0,
           'local_gb_used': 100000000000,
           'hypervisor_type': 'fake',
-          'hypervisor_version': '1.0',
+          'hypervisor_version': utils.convert_version_to_int('1.0'),
           'hypervisor_hostname': CONF.host,
           'cpu_info': {},
           'disk_available_least': 500000000000,