debuginfo-install: doesn't install latest pkgs (RhBug: 1096507)

This is caused because I've installed 'p' (current provider), but we
need to install 'pkg', which correctly throw installed and available
packages.

Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1096507
Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>