New answers tagged kickstart
As of CentOS 7.1 you can use the --bridgeslaves option to add slave interfaces to a bridge, for example: network --device=br0 --bridgeslaves=em1,em2 Note that this doesn't work in CentOS 7.0. If you try it will throw an 'unsupported option' error.
I have been struggling with this recently - not quite the same as you as I was using a local repository, but the same end result. Transpired that when extracting the ISO the files in repodata had their filenames truncated. Compare your repodate folder to (for example) http://mirror.ox.ac.uk/sites/mirror.centos.org/7/os/x86_64/repodata/ This info might help ...
What is this about GNOME Display Manager? That shouldn't be present on an installation-only media. The fact that it is present makes me think you mistakenly downloaded a live media image. Go back to your mirror and get the correct netinstall image.
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