* use lib trace helper function
* add gracefull shutdown
* Add commens for new added exposed function
* Add licence on top of new created files
* Update trace library
* Update configs
* Add attribute and namespance in config
Signed-off-by: Qian Deng <dengq@vmware.com>
* Add api to delete blob and manifest
Enable the capability of registry controller to delete blob and manifest
Signed-off-by: wang yan <wangyan@vmware.com>