Fix typo in filter_rco_reldep's assertion.
Add is_package function.
Fix sack_knows to check packages only.
Fix hy_goal_run_all_flags to resolve only package installonlies.
Fix goal to add only packages if name glob selector is given.
Fix hy_query_run to list only packages.
py: more detailed error string in Sack.add_cmdline_package().
py: add _hawkey.Repo.updateinfo_fn getsetter.
py: add load_updateinfo kwarg to _hawkey.Sack.load_yum_repo.
sack: Also look in /usr/share/rpm for Packages

In the rpm-ostree model, the RPM database lives in /usr/share/rpm, and
is immutable.  Let's look there first, and then fall back to the old
mutable database.

This removes the #define from the public API, as it's not useful to
external consumers.
Rename SOLVABLE_NAME_UPDATE_PREFIX to SOLVABLE_NAME_ADVISORY_PREFIX.
Add advisory object.
Add advisorylist object.
Add advisoryref object.
Add advisoryreflist object.
Add hy_package_get_advisories method.
api change: deprecate hy_package_get_update_*.
tests: add tests for advisory object.
tests: add tests for advisoryref object.
py: add _hawkey.AdvisoryRef type.