jpg_ssim: add suffix '.mjpg' into ssim_test.py
jpg_ssim: add suffix '.mjpg' into ssim_test.py

add jpeg suffix '.mjpg' and '.mjpeg' into ssi-m_test.py,
so that ssim_test.py can test the conformance of those
jpeg clips.

Signed-off-by: wudping <eada3ae4a96a673269eca90300aaefadacf3db15@intel.com>

01org/libyami-utils,mypopydev/libyami-utils,mypopydev/libyami-utils,mypopydev/libyami-utils,01org/libyami-utils,01org/libyami-utils,mypopydev/libyami-utils,01org/libyami-utils