user: get rid of user backend about opensmtpd HOT 4 CLOSED

There is only one consumer of the getbyuid() lookup and I found a way to replace it with a getbyname() call.

I have a diff that should be merged to master very soon, by the end of this week for sure.

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@ericfaurot asked me a question which spanned into a discussion I will summarize here until this ticket is closed:

The only consumer of user_backend->getbyuid() is the offline reloader ... we can either encode the username in the filename which is what my diff did; or ... simply assume that we can use the system's getpwuid() function since to use the offline enqueuing the user had to be able to log into the system which implies getpwnam() / getpwuid() should work [or at least we can make this an OpenSMTPD constraint].

This allows us to kill the user_backend API, make users lookable through a map of kind K_USER and only rely on these mappings when dealing with mail coming from the network.

It will make things much much simpler and nicer :-)

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getbyuid() bit the dust

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user_backend bit the dust. user lookups can be implemented as the K_USERINFO table service

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