Use stable commit for runtest formula

use commit 2468b1f1008ba516fda31e00e588de71447b6fa7

Change-Id: Id4e72e3f279bd122b91979eb884351f2904c382d
diff --git a/tcp_tests/templates/shared-salt.yaml b/tcp_tests/templates/shared-salt.yaml
index b91b5bf..04fb870 100644
--- a/tcp_tests/templates/shared-salt.yaml
+++ b/tcp_tests/templates/shared-salt.yaml
@@ -1059,7 +1059,7 @@
   cmd: |
     sed -i 's/classes\:/classes\:\n- cluster.{{ CLUSTER_NAME }}.infra.runtest/g' /srv/salt/reclass/nodes/_generated/cfg01.{{ DOMAIN_NAME }}.yml;
     git clone https://gerrit.mcp.mirantis.net/salt-formulas/runtest;
-    cd /root/runtest && make install;
+    cd /root/runtest && git checkout 2468b1f1008ba516fda31e00e588de71447b6fa7 && make install;
     salt 'cfg01*' saltutil.refresh_pillar;
     salt 'cfg01*' saltutil.sync_all;
   node_name: {{ HOSTNAME_CFG01 }}