Add an attribute to disable entries automatic injections in /etc/hosts

[pizzamig]

Is your feature request related to a problem? Please describe.
pot populates /etc/hosts with all pots reachable from the same bridge.
However, in very dynamic environments, this features is quite useless

Describe the feature you'd like to have
An attribute to disable the automatic entries injection in /etc/hosts

Describe potential alternatives or workaround you've considered (if any)
A local script that rewrite /etc/hosts at boot