Finalize client side code for psk

Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/tests/data_files/simplepass.psk b/tests/data_files/simplepass.psk
new file mode 100644
index 0000000..93e7ab4
--- /dev/null
+++ b/tests/data_files/simplepass.psk
@@ -0,0 +1 @@
+0a0b0c:010203