interface: feature, search the parent package namespace as well
interface: feature, search the parent package namespace as well

In some cases we want to be able to set the feature value that
all packages in a folder will see, rather than just a specific
package.
This is useful for 'url' where there are multiple packages built
from the same source.

Change-Id: Ib6820a350feba993235086a0d6e131fd96511b86
Reviewed-by: James Laws <0be9c401c6478e890bda80efbe8f8f80c83258b5@alliedtelesis.co.nz>
Signed-off-by: Ridge Kennedy <c60c433c4c1ae237d133641099200771ff6f6f30@alliedtelesis.co.nz>

alliedtelesis/buildsyspp