Fixes: #361
The default request timeout in Spring Integration is `30 seconds`
to not block the thread forever.
However, the logic in the Cafe Demo is longer even that one minute
to wait for all the drinks to be ready to free an order queue.
* Add `spring.integration.endpoint.default-timeout=-1` to wait on the customer request forever for the logic of the application
* Add `spring.task.scheduling.pool.size=10` to avoid deadlock when all the scheduled tasks compete for the same thread by default
* Upgrade to latest Gradle
* Upgrade to the latest Spring Boot
Related to: https://github.com/spring-projects/spring-boot/issues/41477
* Fix TCP tests to use OS-selected port
https://build.spring.io/browse/INTSAMPLES-NIGHTLY-2413
Modify all the `tcpclientserver` tests to rely on the OS-selected port,
in other words set `0` to the server port and get the real port for the
client when server is listening
* * Upgrade to Gradle-4.6
* Fix Travis config do not perform assemble task
