Use correct key name for queue-size parameter
Use correct key name for queue-size parameter

This safes us from the following exception
configparser.NoOptionError: No option 'queue-size' in section: 'graphite'

when queue-size parameter for Graphite section isn't set in the
configuration file.

unixsurfer/haproxystats,unixsurfer/haproxystats,unixsurfer/haproxystats