Fix group readable conf files

https://jenkins.opencord.org/view/Community-PODs/job/verify_berlin-community-pod-1-gpon-adtran_Default_DT_voltha_master_dmi/218/console

Problem: Files checked out have public visibility.

19:40:21 ++ helm list --all -n default -q*19:40:21* ++ grep -E -v docker-registry*19:40:21* WARNING: Kubernetes configuration file is group-readable. This is insecure. Location: /home/jenkins/root/workspace/verify_berlin-community-pod-1-gpon-adtran_Default_DT_voltha_master_dmi/pod-configs/kubernetes-configs/berlin-community-pod-1-gpon-adtran.conf*19:40:21* WARNING: Kubernetes configuration file is world-readable. This is insecure. Location: /home/jenkins/root/workspace/verify_berlin-community-pod-1-gpon-adtran_Default_DT_voltha_master_dmi/pod-configs/kubernetes-configs/berlin-community-pod-1-gpon-adtran.conf
Remove group and world permissions from config files.

Repository: chmod og-rwx; git commit

For filesystem problems update checkout permissions and/or system umask that was indirectly used to set them.