[c-nsp] n5k caches usernames logged in

[Tassos Chatzithomaoglou]

I noticed that when a remote user logs into a n5k and then logs out, the 
"show user-account" command still displays the user credentials.
Waiting for some time or clearing manually the user from config mode 
(?), fixes the above.
Is there a timer for such cached entries that can be changed? Is it 
possible to disable this caching?

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Tassos