context: Use passed in releasever if set
context: Use passed in releasever if set

Don't overwrite the releasever that's set with set_release_ver() with
the value from /etc/os-release.

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