title: How to set the debug level for specific module in fabric?
body: <p>can anyone tell me how to set the debug level for specific module in fabric by changing the env variables in docker file? In the peer log ,we can see</p>
  <blockquote>
  <p>2017-07-24 03:44:44.787 UTC [flogging] setModuleLevel -&gt; DEBU 189 Module 'msp/identity' logger enabled for log level 'WARNING'</p>
  <p>2017-07-24 03:44:44.787 UTC [flogging] setModuleLevel -&gt; DEBU 18a Module 'msp' logger enabled for log level 'WARNING'</p>
  <p>2017-07-24 03:44:44.787 UTC [flogging] setModuleLevel -&gt; DEBU 18b Module 'configvalues/msp' logger enabled for log level 'WARNING'</p>
  <p>2017-07-24 03:44:44.787 UTC [flogging] setModuleLevel -&gt; DEBU 18c Module 'peer/gossip/mcs' logger enabled for log level 'WARNING'</p>
  <p>2017-07-24 03:44:44.787 UTC [flogging] setModuleLevel -&gt; DEBU 18d Module 'gossip/state' logger enabled for log level 'WARNING'</p>
  </blockquote>
  <p>I want some of them to be in debug mode, how to achieve that?
  FYI, I have tried to set <code>GOSSIP_SERVICE_LOGGING_LEVEL=DEBUG</code> and <code>GRPC_LOGGING_LEVEL=DEBUG</code> to make the module gossip/service and grpc in debug mode, but it doesn't work :( ...</p>