Type cleanups:
s/u8/bool/ for "enable_disable"
s/u32/vl_api_interface_index_t/ for "sw_if_index"
Add an API version stamp.
Add a doxygen tag for the binary API.
Add Apache-2 licence text.
Change-Id: I2fa168336efb0f1d9b9b6dec945589cbc5fd5595
Signed-off-by: Dave Barach <dave@barachs.net>