[202012] Check config file not empty after modify it in hostcfgd. #14385
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What I did
Check /etc/pam.d/sshd integrity after modify it in hostcfgd.
Why I did it
Found some incident that /etc/pam.d/sshd become empty file during OR upgrade.
How I verified it
Pass all UT.
Add new UT to cover new code.
Details if related
This is a manually cherry-pick PR for sonic-net/sonic-host-services#36