CI: tweaking jenkins scripts
(cherry picked from commit 42bfb3083026fa5d0cacd2ef1a5833cf6aa49016)

Conflicts:
	jenkins/build_in_shandbox.sh
	jenkins/system_tests_quick/030_prepare_system_tests.sh
CI: jenkins ...
(cherry picked from commit 182e28887a89e26f16f0854dfb28c4125a7addbc)

Conflicts:
	jenkins/system_tests_quick/030_prepare_system_tests.sh
adding qbase-extra
(cherry picked from commit 20bd2f193fde399968d99ea943b9e14a8f3bfec8)