Use pinned version of helm charts repository

Change introduced to prometheus helm chart broke Nordix and all
the jobs started failing, including baremetal ones. [1][2][3]

This change uses pinned version of helm charts git repository
to ensure we bump and pin versions in a controlled manner rather
than pulling latest always.

[1] https://github.com/helm/charts/commit/c38f752d85ed7dd47c1f8ecb123703ff7a9b5d1f
[2] https://jenkins.nordix.org/job/kubernetes-deploy-ubuntu1804-kubespray-baremetal-daily-master/927/console
[3] https://jenkins.nordix.org/job/kubernetes-deploy-ubuntu1804-kubespray-baremetal-daily-master/928/console

provisioner-type:bifrost
installer-type:kubespray
deploy-scenario:k8-calico-nofeature

Change-Id: Iabbdff7e1dc8417b38e8d3f4a4db7b4230736671
1 file changed