regtest: put rgb and yuv reference files in correct place

Originally committed as revision 24118 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/ref/vsynth1/rgb

+05f0719cb52486d9a4beb9cfae3f2571 *./tests/data/vsynth1/rgb.avi
+15213260 ./tests/data/vsynth1/rgb.avi
+243325fb2cae1a9245efd49aff936327 *./tests/data/rgb.vsynth1.out.yuv
+stddev:    3.42 PSNR: 37.43 bytes:  7603200/  7603200

tests/ref/vsynth1/yuv

+aa6b9e862aebcf8902a6d770e7729d59 *./tests/data/vsynth1/yuv.avi
+7610060 ./tests/data/vsynth1/yuv.avi
+c5ccac874dbf808e9088bc3107860042 *./tests/data/yuv.vsynth1.out.yuv
+stddev:    0.00 PSNR:999.99 bytes:  7603200/  7603200

tests/ref/vsynth2/rgb

+f2e9c419023c743bf99aa5b2e55ad233 *./tests/data/vsynth2/rgb.avi
+15213260 ./tests/data/vsynth2/rgb.avi
+b2418e0e3a9a8619b31219cbcf24dc82 *./tests/data/rgb.vsynth2.out.yuv
+stddev:    1.26 PSNR: 46.06 bytes:  7603200/  7603200

tests/ref/vsynth2/yuv

+30a400773ab26f2c83e469198b156f1d *./tests/data/vsynth2/yuv.avi
+7610060 ./tests/data/vsynth2/yuv.avi
+dde5895817ad9d219f79a52d0bdfb001 *./tests/data/yuv.vsynth2.out.yuv
+stddev:    0.00 PSNR:999.99 bytes:  7603200/  7603200