recent dependency tracking issue on trunk

[Jeremy Huddleston]

A problem uninstalling seems to have crept into trunk.  From my testing, this seems to be a printing issue (the wrong port is being printed in the list of dependencies) because other leaf ports are easily removed.

$ sudo port -v uninstall netcdf
--->  Unable to uninstall/deactivate netcdf @4.1.1_0+dap+openmpi, the following ports depend on it:
--->  	netcdf @4.1.1_0+dap+openmpi
Error: port uninstall failed: Please uninstall the ports that depend on netcdf first.