move firewall.yml to /etc/yunohost
bugfix
Merge branch 'dev', remote-tracking branch 'origin/dev' into dev

* origin/dev:
  REST code and header fixes
  Add txrestapi
  REST API for moulinette :d
  Init backup functions
  sudo_ldap_scheme.yml

* dev:
change firewall.yml and separate upnp redirection and port oppening !
bugfix when port already add!
elif is better than else if!
Merge titko's modifications