[Dovecot] 'Doveadm user' could use better error codes

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The error codes for' doveadm user' should be improved to avoid error handling workarounds when scripting commands:

$ doveadm user doveadm user [-a <userdb socket path>] [-x <auth info>] <user mask> […] $ echo $? 1 $ doveadm user foo userdb lookup: user foo doesn't exist $ echo $? 0

Please compare to ID output:

$ id foo id: foo: No such user $ echo $? 1

Regards Thomas

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