Bump up restic to v0.12.1 to fix CVE-2020-26160.
Bump up module "github.com/vmware-tanzu/crash-diagnostics" to v0.3.7 to fix CVE-2020-29652.
The "github.com/vmware-tanzu/crash-diagnostics" updates client-go to v0.22.2 which introduces several break changes, this commit updates the related codes as well
Signed-off-by: Wenkai Yin(尹文开) <yinw@vmware.com>