UTIL: Introduce --socket-activated cmdline option for responders

This option is going to be used for socket-activated responders as they
are special in some ways. So, by knowing this option we can:
- skip owning the debug files as it will be done by the responders' unit
files;
- skip "become_user()", as the process will already be started by the
proper user bu the responders' unit files;
- setup a timeout to shutdown the responder in case it has been
socket-activated and is idle.

This option has been encapsulated on is_socket_activated() function,
which will always return "false" when called on platforms where systemd
is not supported.

For any of the services are taking advantage of this newly introduced
option/function, but later on in this series it's going to be used.

In order to use it, just add SSSD_RESPONDER_OPTS to the poptOption
structure.

Related:
https://fedorahosted.org/sssd/ticket/2243

Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: Pavel Březina <pbrezina@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

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