lib/libnetlink: re malloc buff if size is not enough

lib/libnetlink: re malloc buff if size is not enough

With commit 72b365e8e0fd ("libnetlink: Double the dump buffer size")
we doubled the buffer size to support more VFs. But the VFs number is
increasing all the time. Some customers even use more than 200 VFs now.

We could not double it everytime when the buffer is not enough. Let's just
not hard code the buffer size and malloc the correct number when running.

Introduce function rtnl_recvmsg() to always return a newly allocated buffer.
The caller need to free it after using.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>