JBIDE-18794 add jbosstools.test.jre.* properties and set skipITests=true by default >> master

note: this would mean the way to setup itests/pom.xml for each projec would be:

```
<plugin>
 <groupId>org.eclipse.tycho</groupId>
 <artifactId>tycho-surefire-plugin</artifactId>
 <configuration>
 <skip>${skipITests}</skip>
 <timeout>${surefire.itests.timeout}</skip>
</configuration>
</plugin>
```