pass cache config to the constructor of chart cache
use break loop to instead of return in GetIndexYaml
fix typo reids to redis
pass credential to the reverse proxy and chart client via constructors
add UT cases for cache
add UT cases for ChartOperator
add UT cases for the main API service of chart server
export some consts in the security.go of filter package to let them visible in chartserver package
Daniel Jiang
Steven Zou