Parameterize detach retry max time

Created by: dkeven

Signed-off-by: dkeven keven@kubesphere.io

Fixes https://github.com/kubesphere/helm-charts/issues/175

This is a corresponding PR of https://github.com/yunify/qingcloud-csi/pull/185

This chart is deployable only after that PR is merged & new container image is pushed.