stdout-flush-wrapper.sh: Run with set -x and increase sleep to 10

As some job still fail. There's also suspicion that new docker images are
not being propagated to some LAVA workers, hence use -x to see what's
actually being executed.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I153216bf49848875fc0fab5cb07858dc41d2721e
diff --git a/stdout-flush-wrapper.sh b/stdout-flush-wrapper.sh
index 7a7a44d..2588eca 100755
--- a/stdout-flush-wrapper.sh
+++ b/stdout-flush-wrapper.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/sh -x
 # This script is to workaround an apparent LAVA race condition, when it
 # detects "EOF" (i.e. app termination) before it reads out all the stdout
 # from the app (FVP in this case). The wrapper explicitly runs a command
@@ -9,4 +9,4 @@
 cmd="$1"
 shift
 stdbuf -oL "$cmd" "$@"
-sleep 8
+sleep 10