Increase run-test output on error.

On the host with many cores its possible for the message of an abort to be lost
due to the amount of debug output.
Bug: 18469797

Change-Id: Ibf210fc113166b8cc06ee9aed206780c981d236c
diff --git a/test/run-test b/test/run-test
index 843714b..e9dd86a 100755
--- a/test/run-test
+++ b/test/run-test
@@ -586,7 +586,7 @@
         echo '#################### info'
         cat "${td_info}" | sed 's/^/# /g'
         echo '#################### diffs'
-        diff --strip-trailing-cr -u "$expected" "$output" | tail -n 500
+        diff --strip-trailing-cr -u "$expected" "$output" | tail -n 2000
         echo '####################'
         echo ' '
     fi