Converting DNS to lowercase as required by Istio in Bkp

Converting DNS name to Lowercase as Istio throws an error if DNS is in upper case in bkp, resulting in failure of the helm chart installation.

Error: Error: Ingress.extensions "common-ingress" is invalid: spec.rules[0].host: Invalid value: "bcdrUpgTWE2bkp.energy.azure.com ": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com ', regex used for validation is 'a-z0-9?(.a-z0-9?)*')