fix(snmp): using alpine instead of busybox to run command

Signed-off-by: bravof <fbravo@whitestack.com>

snmp_ee_vnf/helm-charts/eechart/charts/snmpexporter/templates/deployment.yaml

@@ -16,8 +16,8 @@ spec:
     spec:
       initContainers:
         - name: cleanup
-          image: "alpine:latest"
-          command: ['sh', '-c', 'rm -f /etc/snmp_exporter/generator.yml']
+          image: "ubuntu:18.04"
+          command: ['bash', '-c', 'rm -f /etc/snmp_exporter/generator.yml']
           volumeMounts:
             - name: config-volume
               mountPath: /etc/snmp_exporter