Force new location of default Helm chart repository
Location of the default Helm chart repository changed
from: https://kubernetes-charts.storage.googleapis.com
to: https://charts.helm.sh/stable
This change has been addressed by Helm 2.17 release [1] but recommended
Helm version for Guilin is 2.16.10 which still requires manual override.
[1] https://github.com/helm/helm/pull/8901
Issue-ID: ONAPARC-551
Change-Id: I63d94e37f639a213cff38c2e92166c41f29d1a9c
Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>