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

[Gerard Braad]

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