Update salt-minions certs during mcp upgrade

Change-Id: Ie04be1f911d1de5d8a84032ebad6c843d2a916d4
Related-Prod: PROD-29824 (PROD:29824)
(cherry-picked from commit d00c17e95c43b4f75bf08dc2b483d9c07478d56a)
diff --git a/upgrade-mcp-release.groovy b/upgrade-mcp-release.groovy
index a43ddca..c34215d 100644
--- a/upgrade-mcp-release.groovy
+++ b/upgrade-mcp-release.groovy
@@ -478,6 +478,9 @@
                     triggerMirrorJob('git-mirror-downstream-pipeline-library', reclassSystemBranch)
                 }
 
+                // update minions certs
+                salt.enforceState(venvPepper, "I@salt:minion", 'salt.minion.cert', true)
+
                 // Retry needed only for rare race-condition in user appearance
                 common.infoMsg('Perform: updating users and keys')
                 salt.enforceState(venvPepper, "I@linux:system", 'linux.system.user', true)