Adds support for 802.11r fast transition to luci. Corrects the deletion on nasid in issue #844 The R0KH & R1KH options are not perfect as it would be better to separate out each option and do some sanity checking on the values, but that is beyond my capabilities. Signed-off-by: Warren Linton warren@linton.id.au (squashed from three original commits in #994. commit message reworded)