Author: xukun 00228947 <xukun.xu@huawei.com>

Closes #4214 from viper-kun/cleaneventlog and squashes the following commits:

7a5b9c5 [xukun 00228947] fix issue
31674ee [xukun 00228947] fix issue
6e3d06b [xukun 00228947] fix issue
373f3b9 [xukun 00228947] fix issue
71782b5 [xukun 00228947] fix issue
5b45035 [xukun 00228947] fix issue
70c28d6 [xukun 00228947] fix issues
adcfe86 [xukun 00228947] Periodic cleanup event logs