update _parse_ip subroutine. be possible to parse ppp0.

Hello.

I commited https://github.com/krimdomu/Rex/commit/baa6385e4fe176a9099fd82264b5f1e1904f69a0 .

Rex is no longer match ppp0 from _parse_ip subroutine added.

I have changed to match again.

Please merge if it is good.