Removing unnecessary pass instructions

There are some files in Tempest where code has unnecessary
pass instructions. This CR fixes that.

Change-Id: Ie32399d731edad8a4d0b9cdec8aa7e9444eda254

tempest/api/compute/base.py

@@ -173,7 +173,6 @@ class BaseComputeTest(tempest.test.BaseTestCase):
                 pass
             except Exception:
                 LOG.exception('Exception raised deleting image %s' % image_id)
-                pass
 
     @classmethod
     def clear_security_groups(cls):
@@ -188,7 +187,6 @@ class BaseComputeTest(tempest.test.BaseTestCase):
                 LOG.info('Exception raised deleting security group %s',
                          sg['id'])
                 LOG.exception(exc)
-                pass
 
     @classmethod
     def tearDownClass(cls):
@@ -320,7 +318,6 @@ class BaseComputeTest(tempest.test.BaseTestCase):
                 cls.servers_client.wait_for_server_termination(server_id)
             except Exception:
                 LOG.exception('Failed to delete server %s' % server_id)
-                pass
         resp, server = cls.create_test_server(wait_until='ACTIVE', **kwargs)
         if cls._api_version == 2:
             cls.password = server['adminPass']

tempest/common/isolated_creds.py

@@ -404,7 +404,6 @@ class IsolatedCreds(object):
         except exceptions.NotFound:
             LOG.warn('router with name: %s not found for delete' %
                      router_name)
-            pass
 
     def _clear_isolated_subnet(self, subnet_id, subnet_name):
         net_client = self.network_admin_client
@@ -413,7 +412,6 @@ class IsolatedCreds(object):
         except exceptions.NotFound:
             LOG.warn('subnet with name: %s not found for delete' %
                      subnet_name)
-            pass
 
     def _clear_isolated_network(self, network_id, network_name):
         net_client = self.network_admin_client
@@ -422,7 +420,6 @@ class IsolatedCreds(object):
         except exceptions.NotFound:
             LOG.warn('network with name: %s not found for delete' %
                      network_name)
-            pass
 
     def _cleanup_ports(self, network_id):
         # TODO(mlavalle) This method will be removed once patch
@@ -468,7 +465,6 @@ class IsolatedCreds(object):
                 except exceptions.NotFound:
                     LOG.warn('router with name: %s not found for delete' %
                              router['name'])
-                    pass
                 self._clear_isolated_router(router['id'], router['name'])
             if (not self.network_resources or
                 self.network_resources.get('network')):
@@ -492,10 +488,8 @@ class IsolatedCreds(object):
             except exceptions.NotFound:
                 LOG.warn("user with name: %s not found for delete" %
                          creds.username)
-                pass
             try:
                 self._delete_tenant(creds.tenant_id)
             except exceptions.NotFound:
                 LOG.warn("tenant with name: %s not found for delete" %
                          creds.tenant_name)
-                pass

tools/install_venv_common.py

@@ -101,7 +101,6 @@ class InstallVenv(object):
             print('done.')
         else:
             print("venv already exists...")
-            pass
 
     def pip_install(self, *args):
         self.run_command(['tools/with_venv.sh',