nameserver is not set correctly in the appliance

[Rosario Di Somma]

According to the ansible playbook the 'nameserver' option in resolv.conf should be set to 8.8.8.8 but it is instead set to value of the nameserver of the machine where the image is built.

[Rosario Di Somma (mr-rods)]

Seems like dib finds a resolv.conf file in the TMP_MOUNT_PATH/etc folder so it makes a copy https://github.com/openstack/diskimage-builder/blob/master/lib/common-functions#L256, uses the system configured resolv.conf if available https://github.com/openstack/diskimage-builder/blob/master/lib/common-functions#L264 and then restores the copy https://github.com/openstack/diskimage-builder/blob/master/lib/img-functions#L108. Unfortunately the restore is done after the cleanup phase so there are not available hooks to use to fix the issue cleanly.