scripts: Print results from filter-known-issues.py
scripts: Print results from filter-known-issues.py

In order to get rid of doc/scripts/filter-doc-log.sh to make building
the documentation cross-platform, include the functionality in there in
the already existing filter-known-issues.py.

Signed-off-by: Carles Cufi <853081dc8dca4fe6a7e3c984752718b5db36e060@nordicsemi.no>

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