add tests and prepare cmocka

gitlab-ci/functional-test.sh

gitlab-ci/install-dependencies.sh

gitlab-ci/iopsys-supervisord.conf

gitlab-ci/setup.sh

src/Makefile

src/controller.conf

src/core/cntlr_map.c

src/core/cntlr_ubus.c

src/core/config.c

src/core/main.c

src/utils/debug.c

src/utils/debug.h

test/api/json/mapcontroller.validation.json

test/cmocka/Makefile

test/cmocka/test_utils.c

test/cmocka/test_utils.h

test/cmocka/unit_test_cntlr.c