Remove compatibility hack for _hawkey and dnf query
Remove compatibility hack for _hawkey and dnf query

Now only one query class exists therefore the hack is not needed anymore.

rpm-software-management/libdnf,rpm-software-management/libdnf,edynox/libdnf,Conan-Kudo/libhif,edynox/libdnf,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libhif,rpm-software-management/libhif,hughsie/libhif,Conan-Kudo/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,edynox/libdnf,edynox/libdnf,hughsie/libhif,hughsie/libhif,hughsie/libhif,Conan-Kudo/libhif,Conan-Kudo/libhif