Jan Bednar

Since xenial is now default on travis-ci and xenial no longer supports oracle-jdk-8, the distribution or JDK needs to be changed in `.travis.yml` (`dist` to `trusty` or `jdk` to `openjdk8`)...

This adds new output variable `changes` containing git status result, so the next step in pipeline can print this and give user better idea what is wrong. Cross link [CAMEL-15552](https://issues.apache.org/jira/browse/CAMEL-15552)