Removed validate methods that are unused

Author: sudhakar4171

src/ResourceManager/RecoveryServices.Backup/Commands.RecoveryServices.Backup.Models/BaseObjects.cs

@@ -231,19 +231,11 @@ public override void Validate()
     }
 
     public class AzureRmRecoveryServicesBackupRetentionPolicyBase : AzureRmRecoveryServicesObjectBase
-    {
-        public override void Validate()
-        {
-            base.Validate();
-        }
+    {      
     }
 
     public class AzureRmRecoveryServicesBackupSchedulePolicyBase : AzureRmRecoveryServicesObjectBase
-    {
-        public override void Validate()
-        {
-            base.Validate();
-        }
+    {      
     }
 
     public class AzureRmRecoveryServicesBackupJobBase : AzureRmRecoveryServicesBackupManagementContext
@@ -262,12 +254,7 @@ public class AzureRmRecoveryServicesBackupJobBase : AzureRmRecoveryServicesBacku
 
         public DateTime? EndTime { get; set; }
 
-        public TimeSpan Duration { get; set; }
-
-        public override void Validate()
-        {
-            base.Validate();
-        }
+        public TimeSpan Duration { get; set; }       
     }
 
     /// <summary>