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
(cherry picked from commit bbc7ddf883d608b1be44e7a4aee5348256f57dfb)
5eda8fd79f