fix: permission denied when modifying temporary hosts file

[iromli]

The updatelbip.py script unable to modify /etc/hosts.back due to permission issue.

See the following lines: https://github.com/GluuFederation/cloud-native-edition/blob/aa0b30cddf658f6c5dec79a9d5dab3a9cff058e8/pygluu/kubernetes/templates/helm/gluu/charts/config/templates/configmaps.yaml#L389-L396

The location of this file should be moved elsewhere to directory where entrypoint has sufficient access, i.e. /etc/certs.