Enh: Add serial number generation
Add: intermediate menu to ask if we keep net conf.
Add: sic_seal script to seal a VM a generate a UUID for a serial number
Merge branch 'master' into cleaning

Conflicts:
	bootconsole/conf.py
	conf/bootconsole.conf
	startscreen
startscreen: cleaning code, fix adv_hosts method to correctly invoc set_hosts
ifutil : cleaning code, fix write_conf and keep comment in network file