Description of problem:

After doing a minor update on OpenStack environment from 16.1.3 to 16.1.6, observing the following errors in /var/log/containers/neutron/server.log every 10 minutes on 2/3 controllers from the cluster:

~~~
2021-07-05 09:41:56.274 39 ERROR ovsdbapp.backend.ovs_idl.transaction [-] OVSDB Error: The transaction failed because the IDL has been configured to require a database lock but didn't get it yet or has already lost it
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.transaction [-] Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 128, in run
    txn.results.put(txn.do_commit())
  File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 115, in do_commit
    raise RuntimeError(msg)
RuntimeError: OVSDB Error: The transaction failed because the IDL has been configured to require a database lock but didn't get it yet or has already lost it

2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command [-] Error executing command: RuntimeError: OVSDB Error: The transaction failed because the IDL has been configured to require a database lock but didn't get it yet or has already lost it
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command Traceback (most recent call last):
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/api.py", line 111, in transaction
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     yield self._nested_txns_map[cur_thread_id]
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command KeyError: 139964802373784
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command During handling of the above exception, another exception occurred:
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command Traceback (most recent call last):
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/command.py", line 42, in execute
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     t.add(self)
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib64/python3.6/contextlib.py", line 88, in __exit__
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     next(self.gen)
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/networking_ovn/ovsdb/impl_idl_ovn.py", line 183, in transaction
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     yield t
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib64/python3.6/contextlib.py", line 88, in __exit__
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     next(self.gen)
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/api.py", line 119, in transaction
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     del self._nested_txns_map[cur_thread_id]
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/api.py", line 69, in __exit__
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     self.result = self.commit()
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 62, in commit
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     raise result.ex
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 128, in run
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     txn.results.put(txn.do_commit())
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command   File "/usr/lib/python3.6/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 115, in do_commit
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command     raise RuntimeError(msg)
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command RuntimeError: OVSDB Error: The transaction failed because the IDL has been configured to require a database lock but didn't get it yet or has already lost it
2021-07-05 09:41:56.275 39 ERROR ovsdbapp.backend.ovs_idl.command
~~~


Version-Release number of selected component (if applicable):

~~~
less installed-rpms | grep neutron
puppet-neutron-15.5.1-1.20210323133456.7d0406b.el8ost.noarch Fri Jul  2 16:25:12 2021
python3-neutronclient-6.14.1-1.20201113231846.a09e824.el8ost.noarch Fri Jul  2 16:26:03 2021
less installed-rpms | grep ovn
puppet-ovn-15.4.1-1.20201113171358.192ac4e.el8ost.noarch    Fri Jul  2 16:25:08 2021
cat /etc/redhat-release 
Red Hat Enterprise Linux release 8.2 (Ootpa)
cat /etc/rhosp-release 
Red Hat OpenStack Platform release 16.1.6 GA (Train)
~~~

How reproducible:
NA

Steps to Reproduce:
1.
2.
3.

Actual results:
Logs filled with Tracebacks

Expected results:
No tracebacks

Additional info:
NA