subtests.docker_cli.kill: Reflect changes in uncatchable signals

Uncatchable signals are now documented in `man docker run`.
Change `go_lang_bad_signals` test to check man pages and verify that
these signals are not handled (in case golang starts working again)

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Merge pull request #368 from ldoktor/kill

subtests.docker_cli.kill: Reflect changes in uncatchable signals