[C++, Build] Clang formatter and building tests can now be disabled when using the docker clean build script.
[C++, Build] Clang formatter and building tests
can now be disabled when using the docker clean
build script.

Target build environment does not provide all
required dependencies for tests / clang formatter.

Change-Id: I000c231e7190fa5951772ef9c6512d3d14d30502

bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr