* Add change-id and volume-id retrieve logic for both vks and vanilla k8s environment.
* Add change-id and volume-id support code in exposer.
Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>
Change errors.Cause to errors.Is, because github.com/cockroachdb/errors
New() function create a error with error stack with depth 1, but
github.com/pkg/errors's New() function create error with no depth.
Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>