tests: dynappsrc: add test for verifying dynamic element
tests: dynappsrc: add test for verifying dynamic element

Change-Id: I5108c8275de67c7cac7b9fc6f8ca7611a5238ff6
Reviewed-on: https://gpro.palm.com/29843
Tested-by: Wonchul Lee <9841bdbec9dbb2acc2dcaaa1dab0491399f0e464@lge.com>
Reviewed-by: Jeongseok Kim <0c03ab7a1b32f29697716389c3f9549845834271@lge.com>
Tested-by: Jeongseok Kim <0c03ab7a1b32f29697716389c3f9549845834271@lge.com>

justinjoy/gst-plugins-lp,justinjoy/gst-plugins-lp