Enforce linux repo update before calling package update

In case of offline deployment at the moment apt01's repositories were
updated and old taggen ones are removed.

Closes-bug: PROD-36246
Change-Id: If01bbb1d1a7aa4161808e644090491d2e3c35811
diff --git a/upgrade-mcp-release.groovy b/upgrade-mcp-release.groovy
index 823c0b6..bb52add 100644
--- a/upgrade-mcp-release.groovy
+++ b/upgrade-mcp-release.groovy
@@ -874,12 +874,11 @@
             }
 
             stage('Update Drivetrain') {
+                salt.enforceState(venvPepper, "I@linux:system", 'linux.system.repo', true, true, batchSize)
                 salt.enforceState(venvPepper, '*', 'linux.system.package', true, true, batchSize, false, 60, 2)
 
                 if (upgradeSaltStack) {
                     updateSaltStack("I@salt:master", '["salt-master", "salt-common", "salt-api", "salt-minion"]')
-
-                    salt.enforceState(venvPepper, "I@linux:system", 'linux.system.repo', true, true, batchSize)
                     updateSaltStack("I@salt:minion and not I@salt:master", '["salt-minion"]')
                 }