Handling of Maven Environment/System/Filtering

[khmarbaise]

Based on #193 we need to investigate the process builder call for Maven and check how the environment variables and system properties are handled?

Can remove some of them from the environment and call the Maven process with a limited view which is not inherited from the calling process?

The problem with ${project.basedir} seemed to be based on filtering of the resources-its folder... we are filtering too much.
It can't being changed by using the following configuration:

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.2.0</version>
                <configuration>
                    <delimiters>
                        <delimiter>@*@</delimiter>
                    </delimiters>
                </configuration>
            </plugin>
....
        <testResources>
            <!-- specifically for integration tests -->
            <testResource>
                <directory>src/test/resources-its</directory>
                <filtering>true</filtering>
            </testResource>
        </testResources>

Looks like relation to #163