audiotestsrc: Fix the way we check EOS in reverse playback

In reverse playback we were not taking into account the current buffer samples to check if we had reached EOS which was leading to a buffer with PTS = CLOCK_TIME_NONE containing too many frames followed by a useless buffer with pts=0 duration=0, and a g_critical issue in gst_object_sync_values.

Also add a validate based test case. Without that patch this is how the expectation fails:

--- log-asink-sink-expected       2020-05-22 23:22:42.654384579 -0400
+++ log-asink-sink-actual  2020-05-22 23:29:35.671586380 -0400
@@ -27,5 +27,6 @@
 buffer: pts=0:00:00.058820861, due=0:00:00.023219955, flags=discont
 buffer: pts=0:00:00.035600907, due=0:00:00.023219954, flags=discont
 buffer: pts=0:00:00.012380952, due=0:00:00.023219955, flags=discont
-buffer: pts=0:00:00.000000000, due=0:00:00.012380952, flags=discont
+buffer: due=0:00:00.012380953, flags=discont
+buffer: pts=0:00:00.000000000, flags=discont
 event eos: (no structure)