Fix minor spelling mistakes Merges: https://pagure.io/SSSD/sssd/pull-request/3556 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

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>

UTILS: Fixing duplication of pid file declaration Resolves: https://fedorahosted.org/sssd/ticket/2978 Reviewed-by: Fabiano Fidêncio <fabiano@fidencio.org> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

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