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

[Thomas Leuxner]

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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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