Stop using sys.exc_clear as it is not supported in python3

Change-Id: Ic0a37116e31fb41919bc2d84d9d609127a97a3c1

vmware_nsx/shell/admin/plugins/nsxtvd/resources/migrate.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import sys
-
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_serialization import jsonutils
@@ -144,8 +142,6 @@ def delete_v_resources(context, objects):
                 try:
                     get_object(context, obj['id'])
                 except exceptions.NotFound:
-                    # prevent logger from logging this exception
-                    sys.exc_clear()
                     continue
 
                 try:
@@ -198,8 +194,7 @@ def create_t_resources(context, objects, ext_net):
                 try:
                     get_object(context, obj['id'])
                 except exceptions.NotFound:
-                    # prevent logger from logging this exception
-                    sys.exc_clear()
+                    pass
                 else:
                     # already exists (this will happen if we rerun from files,
                     # or if the deletion failed)
@@ -321,8 +316,7 @@ def create_t_resources(context, objects, ext_net):
                                 context, {'security_group_rule': rule_data})
                         except ext_sg.SecurityGroupRuleExists:
                             # default rules were already created.
-                            # prevent logger from logging this exception
-                            sys.exc_clear()
+                            pass
                         except Exception as e:
                             LOG.error(
                                 ">>Failed to create security group %(name)s "
@@ -401,7 +395,6 @@ def migrate_v_project_to_t(resource, event, trigger, **kwargs):
                     default="yes")
         file.close()
     except Exception:
-        sys.exc_clear()
         if from_file:
             LOG.error("Cannot run from file: files not found")
             return

vmware_nsx/shell/admin/plugins/nsxv/resources/dhcp_binding.py

@@ -14,7 +14,6 @@
 
 
 import pprint
-import sys
 
 from neutron_lib import context as n_context
 from oslo_config import cfg
@@ -282,8 +281,6 @@ def nsx_recreate_dhcp_edge_by_net_id(net_id):
                     nsxv_manager.vcns.get_edge(edge_id)
                 except exceptions.ResourceNotFound:
                     # No edge on backend
-                    # prevent logger from logging this exception
-                    sys.exc_clear()
                     LOG.info("Edge %s does not exist on the NSX", edge_id)
                 else:
                     LOG.warning("Network %(net_id)s already has a dhcp edge: "

vmware_nsx/shell/admin/plugins/nsxv/resources/networks.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 import re
-import sys
 import xml.etree.ElementTree as et
 
 from neutron_lib.callbacks import registry
@@ -284,7 +283,6 @@ def delete_nsx_portgroups(resource, event, trigger, **kwargs):
         except Exception as e:
             LOG.error("Failed to delete portgroup %(pg)s: %(e)s",
                       {'pg': portgroup['moref'], 'e': e})
-            sys.exc_clear()
         else:
             LOG.info("Successfully deleted portgroup %(pg)s",
                      {'pg': portgroup['moref']})

vmware_nsx/shell/admin/plugins/nsxv3/resources/networks.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import sys
-
 from vmware_nsx.db import db as nsx_db
 from vmware_nsx.plugins.nsx_v3 import utils as v3_utils
 from vmware_nsx.shell.admin.plugins.common import constants
@@ -100,8 +98,6 @@ def delete_backend_network(resource, event, trigger, **kwargs):
     try:
         nsxlib.logical_switch.get(nsx_id, silent=True)
     except nsx_exc.ResourceNotFound:
-        # prevent logger from logging this exception
-        sys.exc_clear()
         LOG.warning("Backend network %s was not found.", nsx_id)
         return
 
@@ -118,8 +114,6 @@ def delete_backend_network(resource, event, trigger, **kwargs):
     try:
         nsxlib.logical_switch.get(nsx_id, silent=True)
     except nsx_exc.ResourceNotFound:
-        # prevent logger from logging this exception
-        sys.exc_clear()
         LOG.info("Backend network %s was deleted.", nsx_id)
     else:
         LOG.error("Failed to delete backend network %s.", nsx_id)

vmware_nsx/shell/admin/plugins/nsxv3/resources/routers.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import sys
-
 from neutron.db import db_base_plugin_v2
 from neutron.db import l3_db
 from neutron_lib.callbacks import registry
@@ -176,8 +174,6 @@ def delete_backend_router(resource, event, trigger, **kwargs):
     try:
         nsxlib.logical_router.get(nsx_id, silent=True)
     except nsx_exc.ResourceNotFound:
-        # prevent logger from logging this exception
-        sys.exc_clear()
         LOG.warning("Backend router %s was not found.", nsx_id)
         return
 
@@ -193,8 +189,6 @@ def delete_backend_router(resource, event, trigger, **kwargs):
     try:
         nsxlib.logical_router.get(nsx_id, silent=True)
     except nsx_exc.ResourceNotFound:
-        # prevent logger from logging this exception
-        sys.exc_clear()
         LOG.info("Backend router %s was deleted.", nsx_id)
     else:
         LOG.error("Failed to delete backend router %s.", nsx_id)