Fix validate-maintainer.sh script

The script wasn't reporting any errors due to a typo.
Also fix MAINTAINER field for ceilometer-collector image.

Change-Id: Idf1e2746ae395bb05ee679ca71a10a3f103ebfa8

docker/ceilometer/ceilometer-collector/Dockerfile

 FROM kollaglue/fedora-rdo-ceilometer-base
-MAINTAINER Pradeep Kilambi <pkilambi@cisco.com>
+MAINTAINER Kolla Project (https://launchpad.net/kolla)
 
 RUN yum install -y openstack-ceilometer-collector && yum clean all
 

tools/validate-maintainer.sh

 #!/bin/sh
 
-MAINTANER='MAINTAINER Kolla Project (https://launchpad.net/kolla)'
+MAINTAINER='MAINTAINER Kolla Project (https://launchpad.net/kolla)'
 RES=0
 
 for dockerfile in "$@"; do