fixes wrong spice JS referenec

changed include tag to js-require Fixes file not precompiled issue in production.
Remove .DS_Store file
Removed unnecessary script related to SElinux
fixes missing assets files
more minor fixes around asset pipeline changes

1. put back needed icons for settings editing
2. fixed incorrect js syntax after dropping jrails.js
fixes #2371 - removed iconv - causing deprecation notice - block in require: iconv will be deprecated in the future, use String#encode instead
Use plain builder, because UpstreamBuilder cannot diff images
do not include app/assets in rpm

it is not needed, because it is compiled
assest is needed only by devel subpackage and not needed in runtime
Merge remote-tracking branch 'foreman/develop' by rel-eng/build.sh
Automatic rebase to latest nightly Foreman