Adds console logging to swift-drive-audit

This patch adds console logging ability to swift-drive-audit.
There are cases where logging to console is necessary when drive-audit
is done. This can be consumed for flagging errors in monitoring tools
such as icinga.

DocImpact
Change-Id: Ia1e1effcbd89bd2cf6d5b8c64019f1647c736a3a

bin/swift-drive-audit

@@ -150,6 +150,7 @@ if __name__ == '__main__':
     recon_cache_path = conf.get('recon_cache_path', "/var/cache/swift")
     log_file_pattern = conf.get('log_file_pattern',
                                 '/var/log/kern.*[!.][!g][!z]')
+    log_to_console = config_true_value(conf.get('log_to_console', False))
     error_re = []
     for conf_key in conf:
         if conf_key.startswith('regex_pattern_'):
@@ -166,7 +167,8 @@ if __name__ == '__main__':
             re.compile(r'\b(sd[a-z]{1,2}\d?)\b.*\berror\b'),
         ]
     conf['log_name'] = conf.get('log_name', 'drive-audit')
-    logger = get_logger(conf, log_route='drive-audit')
+    logger = get_logger(conf, log_to_console=log_to_console,
+                        log_route='drive-audit')
     devices = get_devices(device_dir, logger)
     logger.debug("Devices found: %s" % str(devices))
     if not devices:

etc/drive-audit.conf-sample

@@ -11,6 +11,10 @@
 # recon_cache_path = /var/cache/swift
 # unmount_failed_device = True
 #
+# By default, drive-audit logs only to syslog. Setting this option True
+# makes drive-audit log to console in addition to syslog.
+# log_to_console = False
+#
 # Location of the log file with globbing
 # pattern to check against device errors.
 # log_file_pattern = /var/log/kern.*[!.][!g][!z]