Increase the run test failure output diff line count.

If there are a lot of threads and deep stacks, we may not see the
beginning of the crash with the failure message.

Bug: 23485091
Change-Id: I854a05d9d9840f0ba10d6317396eb34e1da58c4d
diff --git a/test/run-test b/test/run-test
index 424c2e4..73c92d4 100755
--- a/test/run-test
+++ b/test/run-test
@@ -799,11 +799,11 @@
         echo '#################### info'
         cat "${td_info}" | sed 's/^/# /g'
         echo '#################### diffs'
-        diff --strip-trailing-cr -u "$expected" "$output" | tail -n 2000
+        diff --strip-trailing-cr -u "$expected" "$output" | tail -n 3000
         echo '####################'
         if [ "$strace" = "yes" ]; then
             echo '#################### strace output'
-            tail -n 2000 "$tmp_dir/$strace_output"
+            tail -n 3000 "$tmp_dir/$strace_output"
             echo '####################'
         fi
         echo ' '