ci: For aws-ebs driver use Delete reclaim_policy

The default reclaim policy is set to Retain if the PVs are not deleted
explicitly by the user they might remain around costing money.

This change is introduced to reduce the proliferation of unused PVs that
might be left as a result of multiple CI runs.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

ci/aws/aws-cluster.lokocfg.envsubst

@@ -275,7 +275,10 @@ component "httpbin" {
   certmanager_cluster_issuer = "letsencrypt-staging"
 }
 
-component "aws-ebs-csi-driver" {}
+component "aws-ebs-csi-driver" {
+  // Avoid proliferation of unused PVs.
+  reclaim_policy = "Delete"
+}
 
 component "experimental-istio-operator" {
   enable_monitoring = true