Move the logged exception when `null` keys are allowed for storage to debug leve.

OF-1246 MAM for MUC

OF-867 Wrong key in groupMetaCache evict

OF-512: Allow 'reported' streamhost to be modified.

The file transfer proxy will listen on, and report, a set of network interfaces. Sometimes, the proxy
is not reachable on these addresses directly (for instance in a network environment where NAT comes
into play).

This commit re-purposes the 'xmpp.proxy.externalip' property. Earlier, this was used to make the proxy
bind to a specific interface. As this is quite similar to the functionality provided by the
'network.interface' property, 'xmpp.proxy.externalip' now controls only what interface is reported. It
no longer affect the interface binding process directly. This functionality has also been added to the
admin console.

OF-1156 Warn (and possibly die) on null storage in DefaultCache

Hazelcast clustered cache implemented by MapProxyImpl by preventing null
keys and values being added. Also document this behaviour in the Cache
interface.

OF-477 correct tooltip message in setup

In one case, the outgoing stream header includes the wrong domain, which causes an error in SASL EXTERNAL on some servers.

Note that this also fixes numerous bugs with general MAM itself. A full
comparitive test run was not performed, so it is unclear how many issues
were present in previous builds.

The "with" field is mandatory within MAM, but is not within MAM-MUC; it is
therefore ignored. The specification remains unclear on whether this is
legitimate.

This patch updates the database for MAM-MUC support:
* Upgrade scripts simply update the version, since previous patches included these updates in upgrades.
* New installations have the fields added.
* MUC history logging adds the MAM message identifier.

untested by me, patch by @aberenguel

OF-1228 Prevent NPE on first boot

OF-1247 HSQL VARBINARY now requires length

related to upgrade of HSQL done with OF-955 PR#679

* OF-1188 Add remote domain access check in main thread

By adding an additional access check fo the remote domain in the main loop,
we avoid the need to tie up an OutgoignSessionPromise thread during S2S
initiation.

* OF-1188 Improve logging

Note that audit-policy *is* covered, though appears not to be.

Several of these will re-present the form without processing now.

Still present is the DWR case.

Turns out we protected only the PluginServlet, which is only used for Plugins and not the main Admin console itself.

OF-1244: Admin console DNS SRV evaluation

OF-1245: Prevent error while parsing self-generated certificate

Openfire, during setup, generates a certificate, that it cannot parse later.

This commit changes the generation routine, changing the subjectAltName value
from a tagged object to non-tagged string.

This commit adds an admin console page that allows an administrator to evaluate
the DNS SRV configuration in context of the XMPP domain name and fully qualified
domain name of the sever that is running Openfire.

OF-477: Improve default XMPP domain name and FQDN

This change means that room subject changes are no longer held within the
history transcript, but instead are always sent in a distinct action afterward.

Although this means that repeated changes will not be replayed in history, this
seems to be normal behaviour on other servers, and simplified the history replay
code considerably.

This commit intends to have better default values for two properties of Openfire:
- the XMPP domain name (eg: igniterealtime.org)
- the FQDN of the server (eg: xmpp.igniterealtime.org)

Older code did not always make a clear distinction (ambiguously referring to
'server name'). Having a proper FQDN has become more important, as newer SASL
implementations depend on the client using the same FQDN as what is configured
in the server).

This commit removes support for changing the XMPP domain name at run time (although
you can obviously still change the corresponding property). Instead, the FQDN can
now be changes (although will require a restart).

Additionally, the XMPPServerInfo implementation got a bit of a refactoring: values
that are not expected to be modified (or considered unmodifiable from a functional
perspective), are no longer passed around, but are rather hardcoded in the
implementation. Support for deprecated ServerPort was removed.

Finally, most access to the properties that hold the XMPP domain name and FQDN
are now encapsulated by XMPPServerInfoImpl.

* javadoc fixes and remove legacy SVN RCS tags

* Better javadoc correction as per review