Add read file error per path to fake filesystem

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Configure /etc/network/interfaces in Ubuntu Trusty and later

Restarting networking in Ubuntu Trusty overwrites /etc/resolv.conf
with the data from /etc/network/interfaces and
/etc/resolvconf/resolv.conf.d.

In Ubuntu Lucid changing /etc/network/interfaces does not have effect on
/etc/resolv.conf. So we are updating it manually.

In Centos we only change /etc/resolv.conf since nothing overwrites it.

[#76488842]

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
reformat

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>