libertas: mesh: misc cleanup

Remove unused blindlist code.

Mark a few items const and static where possible. Involved some
code re-ordering, but no code changes.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>