libnet-ssleay-perl: remove from layer

libnet-ssleay-perl is now in meta-perl

Signed-off-by: Armin Kuster <akuster808@gmail.com>
layer.conf: add layer depends.

added layerdepends check for  perl-layer and opemembedded-layer

Signed-off-by: Armin Kuster <akuster808@gmail.com>
nmap: update to version 6.47

for list of changes see:
http://seclists.org/nmap-dev/2014/q3/335

use nmap.inc to house most code.

Signed-off-by: Armin Kuster <akuster808@gmail.com>