Add retry with backoff when creating redis cache for chart server
Add retry with backoff when creating redis cache for chart server

Signed-off-by: Steven Zou <5c7d09ecc61eee689df7048be4e7fb1d1e0b8ebc@vmware.com>

wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,steven-zou/harbor,steven-zou/harbor,wy65701436/harbor,reasonerjt/harbor,steven-zou/harbor,steven-zou/harbor,wy65701436/harbor,reasonerjt/harbor,steven-zou/harbor,reasonerjt/harbor,wy65701436/harbor,steven-zou/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor