Merge conflicts between postfix 3.5.2 and 3.7.3

merge postfix-3.5.0

Resolve conflicts.

Resolve conflicts from last import.

Resolve conflicts from last import.

Resolve conflicts from last import.

Include "defer.h" to get the prototype for defer_append().

Import Postfix 2.8.8. Changes since Postfix 2.8.7:
- The Postfix sqlite client, introduced with Postfix 2.8, had an
embarassing bug in its quoting routine. As the result of a
last-minute code cle

Import Postfix 2.8.8. Changes since Postfix 2.8.7:
- The Postfix sqlite client, introduced with Postfix 2.8, had an
embarassing bug in its quoting routine. As the result of a
last-minute code cleanup before release, this routine returned the
unquoted text instead of the quoted text. The opportunities for
mis-use are limited: Postfix sqlite database files are usually owned
by root, and Postfix daemons usually run with non-root privileges so
they can't corrupt the database. This problem was reported by Rob
McGee (rob0).
- The Postfix 2.8.4 fix for local delivery agent database lookup
errors was incomplete. The fix correctly added new code to detect
database lookup errors with mailbox_transport_maps,
mailbox_command_maps or fallback_transport_maps, but it failed to
log the problem, and to produce a defer logfile record which is
needed for "delayed mail" and "mail too old" delivery status
notifications.
- The trace(8) service, used for DSN SUCCESS notifications, did not
distinguish between notifications for a non-bounce or a bounce
message, causing it to "reply" to mail with the null sender
address. Problem reported by Sabahattin Gucukoglu.
- Support for Dovecot auth over TCP sockets, using code that already
existed for testing purposes. Patrick Koetter kindly provided an
update for the SASL_README file.
- Workaround in the LDAP client for changes in the under-documented
OpenLDAP API, by Victor Duchovni.

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Import Postfix version 2.8.4. Changes since version 2.8.3:
- Performance: a high load of DSN success notification requests could
slow down the queue manager. Solution: make the trace client
async

Import Postfix version 2.8.4. Changes since version 2.8.3:
- Performance: a high load of DSN success notification requests could
slow down the queue manager. Solution: make the trace client
asynchronous, just like the bounce and defer clients.
- The local(8) delivery agent ignored table lookup errors in
mailbox_command_maps, mailbox_transport_maps, fallback_transport_maps
and (while bouncing mail to alias) alias owner lookup.
- Workaround: dbl.spamhaus.org rejects lookups with "No IP queries" even
if the name has an alphanumerical prefix. We play safe, and skip both
RHSBL and RHSWL queries for names ending in a numerical suffix.
- The "sendmail -t" command reported "protocol error" instead of "file
too large", "no space left on device" etc.
- The Postfix Milter client reported a temporary error instead of
"file too large" in three cases.

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Import Postfix 2.6.2.