DVS runtime error

[christ7622]

When I used the following command to run a DVS test for branch 202205, I got a lot of Python exceptions.
sudo pytest -sv --imgname docker-sonic-vs-202205 --html=report.html --self-contained-html

The exceptions all look like:

test_drop_counters.py::TestDropCounters::test_deviceCapabilitiesTablePopulated remove extra link dummy
remove extra link Vlan100@Bridge
Exception ignored in: <bound method ApplDbValidator.__del__ of <conftest.ApplDbValidator object at 0x7f5e29cd1278>>
Traceback (most recent call last):
  File "/home/autotest/wayne/202205/tests/conftest.py", line 165, in __del__
    neighbors = self.get_keys(self.NEIGH_TABLE)
  File "/home/autotest/wayne/202205/tests/dvslib/dvs_database.py", line 115, in get_keys
    table = swsscommon.Table(self.db_connection, table_name)
  File "/usr/lib/python3/dist-packages/swsscommon/swsscommon.py", line 2515, in __init__
    this = _swsscommon.new_Table(*args)
RuntimeError: Unable to connect to redis (unix-socket): Cannot assign requested address