Avoid static declarations of arrays with unknown size.

Visual studio does not like it.

This commit is similar to commit 3815d6c2c
(Avoid designated initializers and static decls of arrays
of unknown size.) but touches more files.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>