Use olso.log directly

As the openstack/common is deprecated, Watcher should use oslo lib
directly to run in the openstack env. So there is much work to do
with oslo. This patch fixed the log part.

Change-Id: I3145a842fe3a22b3d08fec60d180329073edd50f

watcher/cmd/api.py

@@ -22,14 +22,15 @@ import os
 from wsgiref import simple_server
 
 from oslo_config import cfg
+from oslo_log import log as logging
 
 from watcher.api import app as api_app
 from watcher.common.i18n import _
-from watcher.openstack.common import log as logging
 from watcher import service
 
 
 LOG = logging.getLogger(__name__)
+CONF = cfg.CONF
 
 
 def main():
@@ -41,7 +42,7 @@ def main():
     host, port = cfg.CONF.api.host, cfg.CONF.api.port
     srv = simple_server.make_server(host, port, app)
 
-    logging.setup('watcher')
+    logging.setup(CONF, 'watcher')
     LOG.info(_('Starting server in PID %s') % os.getpid())
     LOG.debug("Watcher configuration:")
     cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)