[wperf-lib] Add BSD 3-Clause licenses to wperf-lib related src
wperf-lib/wperf-lib-apps were missing the license at the top of the c,cpp,h files.
Should address WPERF-509
wperf-lib/wperf-lib-apps were missing the license at the top of the c,cpp,h files.
Should address WPERF-509