Remove pointless signal code.

Both code section are noops. Adding an empty signal set to the
existing set produces the same set.
Fix cf-serverd stat()'ing the file tree every second.

The real problem is that signals are ignored by the event loop if they
arrive between calls to select(). The Linux approach would be to use
pselect(), but this doesn't work on some other platforms, most of all
Windows.

So instead we use a different approach: Writing to a socket is safe to
do in a signal handler according to POSIX, so we do that and listen to
that socket in the select() call.

The approach has been tested on both Linux and Windows, and is
verified to work even when forcing the signal to arrive before the
select() call is entered.

As part of this fix, the stat() timeout has been raised to one minute,
so that we still check for file changes reasonably often.

Fixes issue #3479.
Merge pull request #1031 from kacfengine/signal-fixes

Fix cf-serverd stat()'ing the file tree every second.