By checking whether the users have changed whenever they are reloaded, we
improve the visibility of the user reloading process. Using a checksum
allows us to easily compress the information with acceptable loss of
accuracy. Using a CAS loop prevents duplicate messages without losing any
updates even if multiple user reloads result in different outcomes.
SQLITE_OPEN_URI flag was missing causing the databases to be created in
disk instead of in memory. Also added info level log message from created
database in clustrixmonitor.
