fix(logging): Set the log level to debug again.

Plan is to make the Strophe logs more restrictive.
Revert "fix(logging) reduce overly vebose logging"

This reverts commit 09af88088d.

logging_config.js

     // {@link #defaultLogLevel}:
     'modules/RTC/TraceablePeerConnection.js': 'info',
     'modules/statistics/CallStats.js': 'info',
-    'modules/sdp/SDPUtil.js': 'info',
-    'modules/xmpp/JingleSessionPC.js': 'info',
-    'modules/xmpp/strophe.jingle.js': 'info',
     'modules/xmpp/strophe.util.js': 'log'
 };