We currently fetch all of the config errors in order to decide whether or
not to show the bell icon in the web ui (which indicates that there are
errors). We recently added a tenant-status endpoint which returns a simple
error count instead of the entire data structure. Use that to decide
whether to show the bell instead.
This builds on the previous change that fetches the config errors on-demand
rather than storing them in the redux store. With that change and this
combined, we no longer need to store the errors in redux. Instead we will
store the error count in redux so we only have to fetch it once when
switching tenants.
Change-Id: I3dfd911af9ba55dd55ca3649ee5ecf6edaa3581a
a9688d6185