XD-1749 - Update tuple contract to throw exception on getValue for nonexistent field name
XD-1749 un-ignoring some tests, removing others
XD-1825: Remove all javadoc warnings
XD-1652 Fix inconsistent test failures

- Fix inconsistent test failures at `StreamDeploymentIntegrationTests`
  - Use random available port for http source module
XD-293 package-info.java in all packages

- Add missing `package-info.java` to all the packages
- Fix/Update javadoc
- Move `org.springframework.xd.dirt.XDRuntimeException`
to `org.springframework.xd.dirt.util.XDRuntimeException`

Code review changes

- Move `XDRuntimeException` to DIRT base package again
  - Add package-info.java

Fix EOF line at package-info.java files

Fix typo in javadoc
XD-1975 Twitter Dispatcher Has No Subscribers

JIRA: https://jira.spring.io/browse/XD-1975

The root cause was the StreamPlugin stopped the bus
(unbound the producer) before the module was stopped.

- separate the unbinding of bus consumers and producers.
- unbind the consumer before stopping the module
- unbind the producer(s) after stopping the module

In addition, the Custom Twitter adapters emitted messages after stop.
Stop does not block so the context may stop the consumer
before the adapter has actually stopped. For example, the
TwitterSearch module has a `<router/>` subscribed to the adapter's
channel.

- Don't use an Integration scheduler thread
- Block stop() until the thread has terminated
- Put the adapter in `phase` Integer.MAX_VALUE / 2 so it will be stopped before the consumer.

XD-1975 Polishing - PR Comments

Name the thread used by the twitter adapters.
XD-1961: Hide hidden module option info by default

Tweak listeners module option doc
XD-1990: Cross reference Shell and ShellReference
XD-1749 un-ignored MessageStoreBenchmarkTests

The test had been ignored and therefore became out-of-date (i.e. it no longer worked).

The test does not contain any asserts for benchmarking (i.e. it does not assert any performance thresholds).
It only prints out the time spent within each execution.

The following vars can be updated for benchmarking:
* EXECUTIONS_PER_STORE_TYPE
* MESSAGE_GROUPS_PER_EXECUTION
* MESSAGES_PER_GROUP

It is useful as a test for the aggregator processor itself, exercising each message store type.

Also updated the aggregator processor so that it uses the correct Redis client lib (Jedis, no longer Lettuce).

test log4j Polishing
XD-1749b - Change String to Number converter to not map empty string to null.

- Added remaining tests from Spring Batch's DefaultFieldSetTests
XD-2006: Logging improvements

Ensure that each admin and container process has its own unique
log file.

Increased the log file size threshold for rollover.