Increase size of receive buffer
Increase size of receive buffer

Closes #354

Previous attemt to fix #354 was only hiding a true issue with too small
buffer to pick up the message from kernel.
According to https://github.com/vishvananda/netlink/issues/354#issuecomment-401559441
such situation could occur not only during dump of VF list, but also
 * statistics
 * tc rules and tc filters
 * large conn track dump
 * rdma resource details dump for debugging
or any other place where kernel can return more data than default (4kB)
sized buffer could hold.

iproute2 in this case for rtnl_dump_filter_l has buffer with size of
16kB, but we don't have distinction between different receiving funcs,
so I'm proposing to stick with original issue cause finder (kudos to
Parav Pandit aka paravmellanox) who is proposing 64kB as a buffer size.

vishvananda/netlink,paravmellanox/netlink