Fix patch multi-master-check

NSD
1

Hi

Fix for expire state can't transition to ok,
when masters includes broken master.

https://gist.github.com/mimuret/5924683e2719769fa55e540fbbf14634

2

Hi Manabu,

Hi

Fix for expire state can't transition to ok, when masters includes
broken master.

Thank you for the patch, I have imported it into the source code.

Best regards, Wouter