Make it easy to get functional tests screenshots from CI

Right now functional tests located in platform get screenshots put in the tmp dir when a test fails. It would be nice to put them in the target dir of the failing project instead to make it easier to get the screenshots from Jenkins.

This can be achieved by setting this configuration:

              <property>
                <name>screenshotDirectory</name>
                <value>${basedir}/target/screenshots</value>
              </property>