-Taken modification for adding IID in BR info structure.
-Added API to get RPL info for Wi-SUN router and BR.
-Added API to get routing table info from BR.
Deprecate wait() in favour of acquire(), try_acquire(),
try_acquire_for() and try_acquire_until().
Brings Semaphore more into line with CMSIS-RTOS 2 (which uses "acquire"),
itself (as it has "release"), and other classes having "try", "try for"
and "try until".
Also steps away from vague "wait" term - the primary operation here is
to acquire the semaphore, and this will of course sleep.
To get Wi-Sun mesh network working, also nanostack with Wi-Sun support
is needed. ws_empty_functions.c and ws_management_api.h are temporary
included here, so that wisun_tasklet will compiled without problems.
They will replaced with the official versions with next nanostack release.