Remove pointless signal code.

Both code section are noops. Adding an empty signal set to the
existing set produces the same set.
Merge pull request #1023 from tzz/tzz/3429-copy-and-purge

Redmine#3429: acceptance test for copy and purge of empty directory
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.
Revert "Fix cf-serverd stat()'ing the file tree every second."

This reverts commit 2ac1c07f5988a9bacd553fc3ae84b1918e51a426.

16_cf-serverd/01_start/ tests are failing.
Merge pull request #1035 from kacfengine/master

Revert "Fix cf-serverd stat()'ing the file tree every second."
add implementation of getifaddrs for solaris
Merge pull request #1033 from McAtte/support-getifaddr-solaris

Support getifaddr solaris to enable sys.hardware_addresses for that platform
Redmine#2981: acceptance test that adds extra inform-level logging to execresult() and returnszero()