Toku hot backup plugin dumps tons of info to stdout with no way to disable it

The hot backup library continuously dumps TRACE information out to stdout with no way to conditionally enable/disable it.  A dynamic option should be added to the API to allow runtime disabling of these traces.  This can't completely eliminate the traces as due to the LD_PRELOAD nature of the library into the process space, trace output will begin immediately and continue until the backup plugin is initialized and optionally disables the traces.