Read new messages count from master DB server after changing it

We know that this data has just been updated and the slaves probably haven't
caught up yet.

I have no way of confirming neither this bug nor this patch.

Bug: 46388
Change-Id: I3b3dc98bd1dc6cba44a1c8dfdeba745c523a2086
Merge "Read new messages count from master DB server after changing it"