INT-3423 Fix Expression-Based Splitter

JIRA: https://jira.spring.io/browse/INT-3423

Consider a message containing "one one" and a splitter
with expression "payload.split(' ')", only one message
is emitted.

The default Collection created by SpEL is a HashSet.

Change the ExpressionEvaluatingSplitter to expect a
List instead of a Collection.
Update to Spring AMQP 1.3.4, Groovy 2.3.1

Also change rabbit tests to use "localhost" explicitly;
newer brokers don't allow guest except on localhost.
[artifactory-release] Release version 4.0.2.RELEASE
[artifactory-release] Next development version
INT-3383: Update to Smack 4.0.0

The family of Message.(set|get)Properties methods has been factored out
of Smack as an extra extension. Use JivePropertiesManager as replacement.

It is no longer necessary to supress Smack path warnings.

Delete custom smack-config.xml, as all it did was disabling
certain (important) SASL mechanisms. Also remove the unit test that
verified this.

Some unit tests mock ChatManager and Chat for no reason, delete
those lines.

XMPPConnection.getHost() and .getPort() are only valid after the
connection got established, due the fact that those information is
often only available after a DNS SRV lookup was performed. Remove the
lines in unit tests that verified their value.

Remove the truststorePath example in documentation, since Smack 4.0 no
longer provides support for providing a custom truststore. Instead
ConnectionConfiguration in Smack 4.0 allows to set a custom SSLContext
(which then again can provide a TrustManager that uses a custom
truststore).