[PATCH 1/3] Consolidate checks for whether or not to ignore a signal

Both sig_ignored() and do_sigactoin() check for signr to be explicitly or implicitly ignored. Introduce a helper for them. This patch is aimed to help handling signals by pid namespace's init, and was derived from one of Oleg's patches

[PATCH 1/3] Consolidate checks for whether or not to ignore a signal

Both sig_ignored() and do_sigactoin() check for signr to be explicitly or implicitly ignored. Introduce a helper for them. This patch is aimed to help handling signals by pid namespace's init, and was derived from one of Oleg's patches