doveadm sieve plugin: Fixed segfault occuring when main script storage does not support synchronization.
Would occur with any other script storage intialization error as well.

If the main script storage does not allow synchronization, it is now just logged as a debug message.

Logging was mixed up; it logged permanent SMTP failures as errors rather than mere info.
Redirect now handles temporary failure as a separate error condition, causing LDA to return a temporary failure if no other (storage) actions were performed.

Updated binary version.

Based on patch by Timo Sirainen.

Changed handling of ENOSPACE to a normal temporary failure and added handling of ENOQUOTA as a user error.
Patch by Timo Sirainen.

lib-sieve: file storage: Warning about active script not being a symlink was triggered at inappropriate times.
Fixed by issueing the warning only when storage is opened as READWRITE (ManageSieve).

Single script was only initialized and not actually opened.

The validate hook only worked for one extension.

Erroneously set pointer to NULL in sieve_storage_list_deinit().

lda-sieve plugin: Dereferenced default script storage at wrong nesting level, causing an assert failure.

LDAP storage as a plugin is still not problem-free though.

Directory iteration was very broken.

Doveadm-sieve plugin may be broken at this point; not tested so far.

Most important change is that mail service_user was not freed.

Would cause a segfault.
Reported by Coverity.

Handling of edit_mail_header_find() result was incoherent.
Problem reported by Coverity.

Reported by Coverity.

Switch statement item is never reached and return value was bool instead of int.
Problem reported by Coverity.