* Such package names requires at least OpenBSD 6.0.
* Rework get_package_state() to use 'pkg_info -Iq inst:' instead of 'pkg_info -e'
because it understands the branch syntax. It also means we can get rid of
some additional special handling.
This was suggested by Marc Espie:
http://marc.info/?l=openbsd-tech&m=146659756711614&w=2
* Drop get_current_name() because the use of 'pkg_info -Iq inst:' in
get_package_state() means we already have that information available without
needing to do custom parsing. This was also necessary because a name such as
"postfix%stable" does not in itself contain the version information necessary
for the custom parsing. pkg_info -Iq translates such a name to the actual
package name seamlessly.
* Add support for finding more than one package for the supplied package name
which may happen if we only supply a stem.
