LP#1713151: display owning OU in volcopy editor location selector

LP#1713151: display owning OU in volcopy editor location selector

This patch causes the short name of the OU that owns a location
to be displayed after the location name in shelving location selectors
in the item attribute and copy template editors.

To test
-------
[1] Edit an item and verify that the shelving location selector
    displays the org unit shortname in parentheses after the location
    name.
[2] Verify that the location selector in the copy template portion
    also displays the OU short names.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Andrea Neiman <abneiman@equinoxinitiative.org>
Signed-off-by: Ben Shum <ben@evergreener.net>