Remove windows support from Nova driver

The windows support was added to nova-docker in before [1]. However,
it seems the Zun team doesn't have an maintainer of codes in this
part, so let's remove it for now.

[1] https://review.openstack.org/#/c/219657/

Change-Id: I7f7de5ea920b69e6a79d624ae7e0e0f79e69853c

nova/virt/docker/driver.py

@@ -212,9 +212,6 @@ class DockerDriver(driver.ComputeDriver):
         if not network_info:
             return
 
-        if os.name == 'nt':
-            return
-
         container_id = self._get_container_id(instance)
         if not container_id:
             raise exception.InstanceNotFound(instance_id=instance['name'])

nova/virt/docker/network.py

@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import os
-
 from oslo_concurrency import processutils
 from oslo_log import log
 
@@ -27,9 +25,6 @@ LOG = log.getLogger(__name__)
 
 
 def teardown_network(container_id):
-    if os.name == 'nt':
-        return
-
     try:
         output, err = utils.execute('ip', '-o', 'netns', 'list')
         for line in output.split('\n'):

nova/virt/docker/vifs.py

@@ -65,15 +65,10 @@ class DockerGenericVIFDriver(object):
             self.plug_midonet(instance, vif)
         elif vif_type == network_model.VIF_TYPE_IOVISOR:
             self.plug_iovisor(instance, vif)
-        elif vif_type == 'hyperv':
-            self.plug_windows(instance, vif)
         else:
             raise exception.NovaException(
                 _("Unexpected vif_type=%s") % vif_type)
 
-    def plug_windows(self, instance, vif):
-        pass
-
     def plug_iovisor(self, instance, vif):
         """Plug docker vif into IOvisor
 
@@ -337,15 +332,10 @@ class DockerGenericVIFDriver(object):
             self.unplug_midonet(instance, vif)
         elif vif_type == network_model.VIF_TYPE_IOVISOR:
             self.unplug_iovisor(instance, vif)
-        elif vif_type == 'hyperv':
-            self.unplug_windows(instance, vif)
         else:
             raise exception.NovaException(
                 _("Unexpected vif_type=%s") % vif_type)
 
-    def unplug_windows(self, instance, vif):
-        pass
-
     def unplug_iovisor(self, instance, vif):
         """Unplug vif from IOvisor
 

nova/virt/hostutils.py

@@ -13,23 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-
-import ctypes
-import datetime
-import os
-import time
-
 from nova import utils
 
 
 def sys_uptime():
     """Returns the host uptime."""
-
-    if os.name == 'nt':
-        tick_count64 = ctypes.windll.kernel32.GetTickCount64()
-        return ("%s up %s,  0 users,  load average: 0, 0, 0" %
-                (str(time.strftime("%H:%M:%S")),
-                 str(datetime.timedelta(milliseconds=long(tick_count64)))))
-    else:
-        out, err = utils.execute('env', 'LANG=C', 'uptime')
-        return out
+    out, err = utils.execute('env', 'LANG=C', 'uptime')
+    return out