[client] make is_rc_param() error condition fatal
[client] ensure to call fko_destroy() on the correct context if encryption mode could not be determined
[server] make parse_access_file() exit if there is a variable formatting problem
[test suite] add compounded tests for fko-wrapper
[test suite] implement new fwknopd access/fwknopd.conf file writing feature similar to client rc file writing/testing
[client] fix memory leak introduced in 0ff210099