examples: use child directory as name

examples: use child directory as name

This would allow correctly naming an application residing
in a subdirectory. For example, if the example is set to 'path/to/app',
then the name would be 'app'.
This doesn't affect the naming of an example that isn't in a subdirectory.

Signed-off-by: Ali Alnubani <alialnu@mellanox.com>
Acked-by: Luca Boccassi <bluca@debian.org>