wpan-tools: update to 0.8

wpan-tools: update to 0.8

Remove upstreamed patches:
- 001-src-nl_extras.h-fix-compatibility-with-libnl-3.3.0.patch

Changes:
- examples: add README with details to the various examples
- examples: af_ieee802154_tx example
- examples: af_ieee802154_rx example
- examples: add af_packet_rx example
- examples: af_inet6_rx example
- examples: af_packet_tx example
- examples: af_inet6_tx example
- examples: add .gitignore file for examples directory
- src/nl_extras.h: fix compatibility with libnl 3.3.0
- wpan-ping: add the support to set wpan-ping interval
- wpan-ping: Add the filtering function for frame receiving

Signed-off-by: Nick Hainke <vincent@systemli.org>