Revert "Adapt psasim"

This reverts commit b6f6cc89d08b01eddc1b1f20aa9e6ee56f566bc7.

The usage of files /tmp/ could result in race conditions if
several several are run on the same machine.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/psa-client-server/psasim/test/kill_server.sh b/tests/psa-client-server/psasim/test/kill_server.sh
index 0425282..7aba5a3 100755
--- a/tests/psa-client-server/psasim/test/kill_server.sh
+++ b/tests/psa-client-server/psasim/test/kill_server.sh
@@ -8,8 +8,8 @@
 pkill psa_server || true
 
 # Remove temporary files and logs
-rm -f /tmp/psa_notify_*
-rm -f /tmp/psa_service_*
+rm -f psa_notify_*
+rm -f psa_service_*
 rm -f psa_server.log
 
 # Remove all IPCs
diff --git a/tests/psa-client-server/psasim/test/start_server.sh b/tests/psa-client-server/psasim/test/start_server.sh
index 58ab850..fcc8a97 100755
--- a/tests/psa-client-server/psasim/test/start_server.sh
+++ b/tests/psa-client-server/psasim/test/start_server.sh
@@ -8,7 +8,7 @@
 # The server creates some local files when it starts up so we can wait for this
 # event as signal that the server is ready so that we can start client(s).
 function wait_for_server_startup() {
-    while [ -z $(find /tmp -maxdepth 1 -name "psa_notify_*" -printf 1 -quit) ]; do
+    while [ $(find . -name "psa_notify_*" | wc -l) -eq 0 ]; do
         sleep 0.1
     done
 }