remote gdb tests: Extend gdb_select_thread test to verify multiple cores
remote gdb tests: Extend gdb_select_thread test to verify multiple cores

jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor