added to_ord function to pycomp.py
fixed GPG key retrieval error
removed installed function from dnf.queries
removed installed_by_name function from dnf.queries
removed installed_by_nevra function from dnf.queries, added nevra Query method
removed available_by_nevra function from dnf.queries
removed available_by_name function from dnf.queries
downloader: enable failfast
downloader: use LRO_FASTESTMIRRORCACHE
installonly packages: enable enforcing the limit (RhBug:880524)
update the installonlies list.

most notably, installonly(kernel-module) that ensures kernel-modules-extra stays
installed was missing.