Fix init/shutdown process in wkb-ibus and wkb-ibus-test

Change-Id: Ib67336e6e6ea613ff9aa36590afc54edfb86431b
Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@intel.com>
Add missing extern "C" directives in header files

Change-Id: Icd50b604a28b17a642f8037c4fb9d354a33ecd3e
Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@intel.com>
Receive path as parameter in config_register

Change-Id: Ibcf24447cff3cc560b75cf11bc3148c452779f2d
Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@intel.com>