[rdo-list] [tripleo] Fixed some dependency problems for image-build

Hi, here are two minor fixes related to dependencies of ansible-role-tripleo-image-build: * https://review.gerrithub.io/276049 * https://review.gerrithub.io/276054 They were found while testing the role on a clean CentOS 7.2 install. regards, Gerard -- Gerard Braad — 吉拉德 F/OSS & IT Consultant in Beijing http://gbraad.nl gpg: 0x592CFE75