Adding a collection to a library doesn't reload configuration on all app servers

[leonardr]

I added a collection to a library. The app server that handled my 'add collection to library' request was updated, but the other app servers in the cluster continued to believe that the library did not have that collection. Search requests would randomly show or not show the collection, and borrow requests would succeed or fail randomly, depending on which app server handled the request. I waited a few minutes and the problem didn't seem to be going away, so I restarted the app servers, which fixed it.