UTIL: Remove signal.h from util/util.h signal.h is not used directly by util/util.h. The header file signal.h must be included in 8 files and removing it from util.h it had to be added only to 5 missing file. But util/util.h is include in 377 files Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

sss_tools: add test if sssd is running Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

TOOLS: New helper tool sss_signal A minimal tool whose only purpose is to signal the monitor with SIGUSR2. The tool will be executed by the system bus in order to provide system activation, so it's packaged in libexec. Reviewed-by: Pavel Březina <pbrezina@redhat.com>