Share time with the host

[Random-Liu]

Kernel monitor discard old kernel log based on the timestamp.

However, usually kernel log timestamp doesn't contain year and timezone information, e.g. Oct 23 16:59:23. There is no way to apply the right timezone, if the timezone inside the pod is different from the host.

This PR mount the /etc/localtime inside the container to make sure the container in the same zone with the host.

Sometimes /etc/localtime may be a symlink file. I've tested that both docker and kubernetes mount will follow the symlink and mount the real content.

@dchen1107

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This change is 

[dchen1107]

I am closing this one since #39, which covers this issue, was merged. Please reopen it if I were wrong. Thanks!