There is a python-ovs bug that allows transactions to be executed
before it has started monitoring the db for changes. This breaks
ovsdbapp's AddCommand behavior, which looks up a row in memory
post-commit to return it to the caller, because we process the
reply from ovsdb-server that has the UUID in it, but when we try to
look it up in memory, it isn't there since that is handled via the
monitor notifications.
Since we don't care about the return value, we can just ignore the
KeyError. In addition, the request to Idl.cond_change() to monitor
only the neutron_pg_drop table was failing for a similar reason--
it is called before the initial monitor request is sent, so
directly setting table.condition will allow the condition to be
added to the initial monitor request.
Closes-Bug: #1938766
Change-Id: I78af15970a86923fb810e903d38634b6e60a8fe4
76ee64f4a8