scripts: runner: core: don't print unless self.debug
scripts: runner: core: don't print unless self.debug

Guard a pair of stray printlines with "if self.debug:", so they don't
happen by default.

Signed-off-by: Marti Bolivar <fd5da480b758a78208111e6ae5c6806e1f887137@opensourcefoundries.com>

GiulianoFranchetto/zephyr,explora26/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr,mbolivar/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,Vudentz/zephyr,explora26/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,kraj/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,explora26/zephyr,zephyriot/zephyr,ldts/zephyr,explora26/zephyr,mbolivar/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,ldts/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,nashif/zephyr,ldts/zephyr,zephyriot/zephyr,galak/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,punitvara/zephyr,explora26/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,kraj/zephyr,Vudentz/zephyr,mbolivar/zephyr,kraj/zephyr,zephyriot/zephyr,Vudentz/zephyr,nashif/zephyr