remove "ccnet/seaf-daemon exit abnormally" message
remove "ccnet/seaf-daemon exit abnormally" message

When ccnet/seaf-daemon exited, it's hard to tell whether this is
a normal system shutdown.

cloudcopy/client,haiwen/seafile-client,cloudcopy/client,ggkitsas/seafile-client,lucius-feng/seafile-client,wgaalves/seafile-client,haiwen/seafile-client,lucius-feng/seafile-client,cloudcopy/client,haiwen/seafile-client,daodaoliang/seafile-client,lucius-feng/seafile-client,ggkitsas/seafile-client,daodaoliang/seafile-client,cloudcopy/client,losingle/seafile-client,lucius-feng/seafile-client,wgaalves/seafile-client,losingle/seafile-client,ggkitsas/seafile-client,ggkitsas/seafile-client,daodaoliang/seafile-client,haiwen/seafile-client,daodaoliang/seafile-client,wgaalves/seafile-client,wgaalves/seafile-client,losingle/seafile-client,losingle/seafile-client