Fix regression (INVALID packets on FORWARD were accepted)
Use upstart for ddclient daemon management

As ddclient stop init.d is not working in all cases.

This avoids multiple ddclient daemon instances with memory and CPU consumption.
Added migration script to stop ddclient instances from init.d script

And do what enableActions do
Merge pull request #564 from Zentyal/firewall-fwd-fix

Fix regression (INVALID packets on FORWARD were accepted)
Added defensive code to avoid leaving broken packages

Using silentRoot
Merge pull request #567 from Zentyal/ejhernandez/ddclient-upstart

Use upstart for ddclient daemon management
Merge branch '3.0'

Conflicts:
	main/firewall/ChangeLog
	main/network/ChangeLog
	main/network/src/EBox/Network.pm
	main/ntp/src/scripts/enable-module