postgresql: tune db01 to handle higher loads
    
    We have been running on the defaults on db01 for a while here, but bodhi
    seems to be having db query speed issues, so lets try and beef up the
    postgresql config.
    
    Increase shared_buffers as we have a lot of memory.
    Increase workers as we have 24 cpus and 8 workers (default) might be a
    bottleneck. Increase the related worker settings with base workers.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>