Prevent WritePendingException during delivery of BOSH packets.

This exception caused serious trouble, e.g.:
- Clients got an invalid/incomplete packet, which breaks them.
- Openfire logged related exceptions like org.jivesoftware.openfire.http.HttpConnectionClosedException: The http connection is no longer available to deliver content

It was caused by calling complete() although the previous write() has not completed (due to its async nature).

I also restructured that the Content-Length header is only set once.

Fixes OF-989.
See also https://community.igniterealtime.org/thread/57622

OF-983 Do not bounce packets while lock is held

OF-984 / OF-985 Dialback fixes for to attribute and TLS

OF-631 Reduce salt size to fit database

The salt size was 32, and the database column was a VARCHAR(32).

However, the salt was base64 encoded prior to insertion, and this caused it to
be too large. Therefore this patch reduces the size to 24 bytes, which expands
to 8 units of three bytes encoded as four characters, hence 32 characters total.

OF-631 Fix all the SCRAM faults

A few places all use the domain.intern() as the key for a synchronized block.

This can lead to clashes when multiple semantics conflict, and this can in turn
lead to a deadlock, as witnessed in OF-984.

This changes two cases to use a prefixed string to namespace the locking.

OF-983 appears to be caused by a complex bouncing process run while the
authentication check lock is held. This patch moves the actual bounce to
outside the synchronized block, so the code no longer deadlocks.

Untested, but based on the stack traces in OF-983 reports.

Revert "OF-115 Remove race during outgoing session creation"

Ignore test that makes Travis fail.

This reverts commit d0667e21.

While I think the general code is right, it's clearly got serious shortcomings
so I think it's best to back this out for now.

Refactor connectionmanagement

Don't log problems that we cannot resolve properly (and originate outside of our influence) to warn.

Conflicts:
	src/i18n/openfire_i18n_en.properties
	src/java/org/jivesoftware/openfire/session/LocalOutgoingServerSession.java

Document port number to use http instead of https

OF-115 Remove race during outgoing session creation

OF-473: Revert original patch

Fix NPE in Node.java when changing node configuration.

Add and document LDAP startTls option to setup

This reverts commit f25491c7.