Update cadvisor/init.sls

cadvisor/init.sls

 {% set docker = salt['pillar.get']('docker', {}) %}
 {% set volume = docker.volume_root | default('/srv/docker') ~ '/cadvisor' %}
-{% set image = 'google/cadvisor:latest' %}
+{% set image = 'gcr.io/cadvisor/cadvisor:v0.37.0' %}
 {% set cadvisor = salt['pillar.get']('cadvisor', {}) %}
 {% set metrics = cadvisor.get('metrics', {}) %}
 {% set port = '9999' %}