Revert "monitor.c: sanity check on waitpid return value"

It's reported to errors in parallel starts.

Reported-by: "S.Çağlar Onur" <caglar@10ur.org>

This reverts commit 6b7916695264238a490971e8cd87612154fc18b1.
configure: support for the "docbook2man" utility to build the documentation

This adds docbook2man as an alternative name for the docbook compiler.
As that name was used on Debian based systems for an older version of the tool,
this change also adds a check so that docbook2man is never used on Debian based
systems.

Reported-by: Peter Simons <simons@cryp.to>
Reported-by: Christian Bühler christian@cbuehler.de
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
lxc.conf: Add reference to capabilities manpage

This adds a reference to capabilities(7) to the lxc.conf manpage.

Signed-off-by: Tomáš Pospíšek <tpo_deb@sourcepole.ch>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>