[Dovecot] Some Doveadm Tools lack proper exit codes

[Thomas Leuxner]

Happy New Year Everyone,

and *yes* it's that time of the year to archive old stuff again. Please implement proper error codes to support this (scripting) endeavor.

=> Good

$ doveadm user foo
userdb lookup: user foo doesn't exist
$ echo $?
2

=> Bad

$ doveadm acl get -u tlx at leuxner.net FOO
doveadm(tlx at leuxner.net): Error: Can't open mailbox FOO: Mailbox doesn't exist: FOO
ID                                                                                                  Global Rights
$ echo $?
0

$ doveconf -n | head
# 2.1.rc1 (056934abd2ef): /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.3 

Thanks
Thomas
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