tests: Add screenshot recording capability to weston-test
tests: Add screenshot recording capability to weston-test

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=83981
Signed-off-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>
Reviewed-By: Derek Foreman <2f97e0f0bc172406aab8ccd42dab54c95bab8759@osg.samsung.com>

Fantu/compositor-spice,giucam/weston,kwm81/weston,mchalupa/weston,Fantu/compositor-spice,eyolfson/weston,jonnylamb/weston,sir-murray/weston,Gnurou/weston,Gnurou/weston,sir-murray/weston,kwm81/weston,mchalupa/weston,krezovic/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,udoprog/weston,xorgy/weston,jonnylamb/weston,eyolfson/weston,krezovic/weston,Fantu/compositor-spice,giucam/weston