1. Enhance the cleanup logic;
2. Add the missing keypair into the resource logger;
3. Document enhancements on installation and contribution;
4. Fix the bug when parsing the image version string in DIB;
5. Fix the typo in Rest API specification;
Change-Id: Ibf4a1c7828ee4522938b4b55f9a8af5e6c6a133b
d7d9575dda