[lr/ifcfg-deprecation-notices] add a couple of ifcfg-rh deprecation notices
While adding the dhclient deprecation notices, I figured that we could do the same for already-deprecated ifcfg plugin: warn on load, and in the build configuration summary.
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While adding the dhclient deprecation notices, I figured that we could do the same for already-deprecated ifcfg plugin: warn on load, and in the build configuration summary.