Fix for #3554

v4l2_scan_controls_enumerate_menu is unused and causes ioctl error on
RaspberryPi and possibly other Video4Linux variants. See
http://www.raspberrypi.org/forum/viewtopic.php?f=43&t=65026 for more
detail.
tuned some tests
Merge pull request #2443 from waveform80:issue-3554
Merge pull request #2445 from ilya-lavrenov:ocl_perf