Unattended install fails in Docker environment

[brucellino]

Unattended installation of the perfsonar-toolkit metapackage fails miserably, because debconf wants to be the boss of everyone.

As far as I can tell, from the result attached, the errors are as follows (and are mostly due to the fact that we are testing in containers

• policy: invoke-rc.d: policy-rc.d denied execution of start. : this cannot happen in a container
• iptables: invoke-rc.d: policy-rc.d denied execution of start. iptables v1.4.14: can't initialize iptables table 'filter'
• rsyslogd: can't start the service invoke-rc.d: policy-rc.d denied execution of start.
• sysctl: setting key "vm.max_map_count": Read-only file system - can't do this in containers (duh)

There seem tom be a few others. The way to solve this would be to replicate the dpkg configure script.