Allow -v option to change log level

Setting logging level to 'NOTSET' would tell logging module to inherit
logging level from handlers. Since the verbosity of handlers is
controlled by -v option, this allows sign_apex.py to give verbose output
if -v is specified.

Test: th
Bug: 307191956
Change-Id: I9c1db107cf4eae80ab570d892b0465b3902298fd

tools/releasetools/common.py

@@ -210,7 +210,7 @@ def InitLogging():
           '': {
               'handlers': ['default'],
               'propagate': True,
-              'level': 'WARNING',
+              'level': 'NOTSET',
           }
       }
   }