Fix target during upgrade process of saltstack in Update Drivetrain pipeline.

Change-Id: I399502a15aad419bf5c7217e11b74c8f98f4ccee
Related: PROD-21966
diff --git a/upgrade-mcp-release.groovy b/upgrade-mcp-release.groovy
index 62e5622..e976f9a 100644
--- a/upgrade-mcp-release.groovy
+++ b/upgrade-mcp-release.groovy
@@ -46,7 +46,7 @@
     }
 
     def saltVersion = salt.getPillar(venvPepper, 'I@salt:master', "_param:salt_version").get("return")[0].values()[0]
-    def saltMinionVersions = salt.cmdRun(venvPepper, "*", "apt-cache policy salt-common |  awk '/Installed/ && /$saltVersion/'").get("return")
+    def saltMinionVersions = salt.cmdRun(venvPepper, target, "apt-cache policy salt-common |  awk '/Installed/ && /$saltVersion/'").get("return")
     def saltMinionVersion = ""
 
     for(minion in saltMinionVersions[0].keySet()){