schema: Fix upgrade issue for 4.9.1.0->4.9.2.0

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

engine/schema/src/com/cloud/upgrade/DatabaseUpgradeChecker.java

@@ -280,7 +280,7 @@ public DatabaseUpgradeChecker() {
 
         _upgradeMap.put(CloudStackVersion.parse("4.9.0"), new DbUpgrade[] {new Upgrade490to4910(), new Upgrade4910to4920()});
 
-        _upgradeMap.put(CloudStackVersion.parse("4.9.1.0"), new DbUpgrade[] {new Upgrade490to4910(), new Upgrade4910to4920()});
+        _upgradeMap.put(CloudStackVersion.parse("4.9.1.0"), new DbUpgrade[] {new Upgrade4910to4920()});
 
         //CP Upgrades
         _upgradeMap.put(CloudStackVersion.parse("3.0.3"), new DbUpgrade[] {new Upgrade303to304(), new Upgrade304to305(), new Upgrade305to306(), new Upgrade306to307(), new Upgrade307to410(),