helios-testing: use same logging configuration as helios-testing-common
helios-testing: use same logging configuration as helios-testing-common

Ensure that the logback-test.xml from the helios-testing-common jar is
used.

gtonic/helios,mavenraven/helios,mattnworb/helios,gtonic/helios,mattnworb/helios,mavenraven/helios,spotify/helios,spotify/helios,spotify/helios,gtonic/helios,mattnworb/helios,mavenraven/helios