After OVN DB leader restarts there is a period before a new leader has
been elected where the old leader is returned in the cluster status.
This can result in a failure to apply the connection settings if a
different leader is elected.

Wait for a few seconds for the leader election to complete.

Change-Id: I20f08c986fa6b4b3ec668dad649e69f23119796b
Closes-Bug: #2059124