RPM packager: stop forcing use of IPv4 at image build time
YUM for CentOS 6 does not support the "ip_resolve" configuration option, so the tweaks applied in the Dockerfile are not fully effective. Furthermore, hardcoded file paths make those tweaks prone to breaking due to package updates. It is also simpler to disable IPv6 globally after creating a Docker container than trying to patch all places where it can potentially be used at image build time.
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