openvswitch.h: Note that 64 bit ints are 4-aligned.

openvswitch.h: Note that 64 bit ints are 4-aligned.

In general, all Netlink 64-bit data may be 4-byte aligned, due to
netlink header and attributes being 4-aligned.

To avoid unaligned access the data should be copied out of the netlink
attribute before access.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>