metricsd: Fix logging initialization.

metricsd should only log to a single location (stderr or syslog):
* standard error if --logtostderr is set or metricsd runs in the
  foreground.
* syslog if --logtosyslog is set or metricsd is daemonized.

Bug: 25472752
Change-Id: Idb918714e1b6975d79682f22495a7ca708d4d97d
diff --git a/metricsd/metrics_daemon.rc b/metricsd/metrics_daemon.rc
index 0ee577e..8b24749 100644
--- a/metricsd/metrics_daemon.rc
+++ b/metricsd/metrics_daemon.rc
@@ -1,7 +1,7 @@
 on post-fs-data
     mkdir /data/misc/metrics 0770 system system
 
-service metrics_daemon /system/bin/metrics_daemon --uploader -nodaemon
+service metrics_daemon /system/bin/metrics_daemon --uploader --foreground --logtosyslog
     class late_start
     user system
     group system dbus inet