Fix issues that the Context is null even when it's indicated in parameter.

Author: EmmaZhu

src/Common/Storage/Commands.Storage/Blob/Cmdlet/StartAzureStorageBlobCopy.cs

@@ -173,7 +173,7 @@ public string SrcContainer
         [Parameter(HelpMessage = "Source Azure Storage Context Object", ValueFromPipeline = true, ValueFromPipelineByPropertyName = true, ParameterSetName = FileParameterSet)]
         [Parameter(HelpMessage = "Source Azure Storage Context Object", ValueFromPipeline = true, ValueFromPipelineByPropertyName = true, ParameterSetName = FileToBlobParameterSet)]
         [Parameter(HelpMessage = "Source Azure Storage Context Object", ParameterSetName = UriParameterSet)]
-        public new AzureStorageContext Context { get; set; }
+        public override AzureStorageContext Context { get; set; }
 
         [Parameter(HelpMessage = "Destination Storage context object", Mandatory = false)]
         public AzureStorageContext DestContext { get; set; }

src/Common/Storage/Commands.Storage/Common/StorageCloudCmdletBase.cs

@@ -43,7 +43,7 @@ public class StorageCloudCmdletBase<T> : CloudBaseCmdlet<T>
     {
         [Parameter(HelpMessage = "Azure Storage Context Object",
             ValueFromPipelineByPropertyName = true)]
-        public AzureStorageContext Context { get; set; }
+        public virtual AzureStorageContext Context { get; set; }
 
         [Parameter(HelpMessage = "The server time out for each request in seconds.")]
         public virtual int? ServerTimeoutPerRequest { get; set; }

src/Common/Storage/Commands.Storage/File/AzureStorageFileCmdletBase.cs

@@ -34,7 +34,7 @@ public abstract class AzureStorageFileCmdletBase : StorageCloudCmdletBase<IStora
             ValueFromPipeline = true,
             ParameterSetName = Constants.SpecificParameterSetName,
             HelpMessage = "Azure Storage Context Object")]
-        public new AzureStorageContext Context { get; set; }
+        public override AzureStorageContext Context { get; set; }
 
         protected FileRequestOptions RequestOptions
         {

src/Common/Storage/Commands.Storage/File/Cmdlet/NewAzureStorageFileSasToken.cs

@@ -121,7 +121,7 @@ public string Policy
             ValueFromPipeline = true,
             HelpMessage = "Azure Storage Context Object",
             ParameterSetName = NameSasPolicyParmeterSet)]
-        public new AzureStorageContext Context { get; set; }
+        public override AzureStorageContext Context { get; set; }
 
         /// <summary>
         /// Execute command

src/Common/Storage/Commands.Storage/File/Cmdlet/NewAzureStorageShareSasToken.cs

@@ -68,7 +68,7 @@ public string Policy
         [Parameter(
             ValueFromPipeline = true,
             HelpMessage = "Azure Storage Context Object")]
-        public new AzureStorageContext Context { get; set; }
+        public override AzureStorageContext Context { get; set; }
 
         // Overwrite the useless parameter
         public override int? ServerTimeoutPerRequest { get; set; }

src/Common/Storage/Commands.Storage/File/Cmdlet/StartAzureStorageFileCopy.cs

@@ -120,7 +120,7 @@ public class StartAzureStorageFileCopyCommand : StorageFileDataManagementCmdletB
             Mandatory = false,
             ValueFromPipelineByPropertyName = true,
             ParameterSetName = ShareNameParameterSet)]
-        public new AzureStorageContext Context { get; set; }
+        public override AzureStorageContext Context { get; set; }
 
         [Parameter(HelpMessage = "Destination Storage context object", ParameterSetName = ContainerNameParameterSet)]
         [Parameter(HelpMessage = "Destination Storage context object", ParameterSetName = ContainerParameterSet)]