Fix regression causing the default log level to become WARNING

Change I96229438d3a2271c830bcd926326e7b4a94ccac9 removed the verbose option
in the opposite fashion from what how it was intended when the option was
deprecated. It regressed the default log level back to WARNING.
See change I306535c6ca5dbdaf9398b44697578a3a30e52111 for original reasoning
behind this deprecation. This change fixes the default level as it was
intended.

Change-Id: Ia9cd55004ce05761de733adae00554ff021794a8

oslo_log/log.py

@@ -322,7 +322,7 @@ def _refresh_root_level(debug):
     if debug:
         log_root.setLevel(logging.DEBUG)
     else:
-        log_root.setLevel(logging.WARNING)
+        log_root.setLevel(logging.INFO)
 
 
 def _setup_logging_from_conf(conf, project, version):

oslo_log/tests/unit/test_log.py

@@ -97,12 +97,12 @@ class CommonLoggerTestsMixIn(object):
         logger = logging.getLogger(logger_name)
         self.assertEqual(logging.DEBUG, logger.getEffectiveLevel())
 
-    def test_will_be_warning_if_debug_flag_not_set(self):
+    def test_will_be_info_if_debug_flag_not_set(self):
         self.config(debug=False)
         logger_name = 'test_is_not_debug'
         log.setup(self.CONF, logger_name)
         logger = logging.getLogger(logger_name)
-        self.assertEqual(logging.WARNING, logger.getEffectiveLevel())
+        self.assertEqual(logging.INFO, logger.getEffectiveLevel())
 
     def test_no_logging_via_module(self):
         for func in ('critical', 'error', 'exception', 'warning', 'warn',
@@ -831,7 +831,7 @@ class FastWatchedFileHandlerTestCase(BaseTestCase):
         log_path = self._config()
         logger = log._loggers[None].logger
         text = 'Hello World!'
-        logger.warning(text)
+        logger.info(text)
         with open(log_path, 'r') as f:
             file_content = f.read()
         self.assertTrue(text in file_content)
@@ -865,7 +865,7 @@ class ConfigTestCase(test_base.BaseTestCase):
 
         log._setup_logging_from_conf(conf, 'test', 'test')
         self.assertEqual(conf.debug, False)
-        self.assertEqual(log.WARN, log_root.getEffectiveLevel())
+        self.assertEqual(log.INFO, log_root.getEffectiveLevel())
 
         shutil.copy(paths[1], paths[0])
         conf.mutate_config_files()

releasenotes/notes/info-logging-7b7be9fc7a95aebc.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - When removing the "verbose" option, the default logging level was set to
+    "WARNING" by mistake. Fixed it back to "INFO".