Use smaller image and condense steps

fuel/centos base image includes both
ruby21-puppet and logrotate, reducing
the number of steps for docker build.

Additionally, condense some commands
where sensible in dockerfiles

blueprint small-docker-container-base-image

Change-Id: I0fe2d4e1b59f1b1124cb0dde48e46a8c176a51ab
Merge "Use smaller image and condense steps"