Further optimize the netstat -rn parsing
Further optimize the netstat -rn parsing

This is up to 2x faster than the previous implementation

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

chef/ohai,jaymzh/ohai,chef/ohai,jaymzh/ohai