User new functions (inspired by libmnl) to do type safe access of routeing attributes
Both rtnl_talk and rtnl_dump had a callback for handling portions of netlink message that do not match the correct pid or seq. But this callback was never used by any part of iproute2 so remove it.
Go through source files and remove all trailing whitespace Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
