Use LABEL instruction instead of MAINTAINER (deprecated) instruc-
tion as suggested by Docker's official dockerfile guide.
docs.docker.com/engine/reference/builder/#maintainer-deprecated
Closes-Bug: #1683652
Change-Id: Ie87a1ddf31aefcd0b623fd2837d78de420e76898
The script wasn't reporting any errors due to a typo.
Also fix MAINTAINER field for ceilometer-collector image.
Change-Id: Idf1e2746ae395bb05ee679ca71a10a3f103ebfa8