Fix required dependencies in readme
Fix typo in fedora build
Fix missing dependencies for fedora
Fix small typo in tutorial
Add dependency for check on libpthread
Make check optional

It was already optional at cmake time, but the tests were build
unconditionnaly

Signed-off-by: Jérémy Rosen <jeremy.rosen@openwide.fr>
Make use of luac optional
Allow to override the path to iptables binaries

Some distro install ipatables in /usr/sbin instead of /sbin
Allow use of external libiniparser

Signed-off-by: Jérémy Rosen <jeremy.rosen@openwide.fr>
Improve iniparser library handling
Remove luaunit from install

This module is not really used so it is better not to install it for
now.
Merge branch 'feature/cross-compile-fix' into develop

* feature/cross-compile-fix:
  Remove luaunit from install
  Improve iniparser library handling
  Allow use of external libiniparser
  Allow to override the path to iptables binaries
  Make use of luac optional
  Make check optional
  Add dependency for check on libpthread
  Fix small typo in tutorial
Fix iptables path define
Fix getting started config