[log] Made log.cc more readable for isEnabled function
[log] Made log.cc more readable for isEnabled function

victorisildur/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,nkawahara/Graphite,fhijaz/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,8l/Graphite,victorisildur/Graphite,nkawahara/Graphite,8l/Graphite,victorisildur/Graphite,victorisildur/Graphite,nkawahara/Graphite,fhijaz/Graphite,8l/Graphite,nkawahara/Graphite,fhijaz/Graphite,fhijaz/Graphite,8l/Graphite