Additional changes for RoleAssignments

Author: shuagarw

src/ResourceManager/Resources/Commands.Resources/Models.Authorization/AuthorizationClientExtensions.cs

@@ -128,6 +128,7 @@ public static PSRoleAssignment ToPSRoleAssignment(this ClassicAdministrator clas
             {
                 RoleDefinitionName = classicAdministrator.Properties.Role,
                 DisplayName = classicAdministrator.Properties.EmailAddress,
+                SignInName = classicAdministrator.Properties.EmailAddress,
                 Scope = "/subscriptions/" + currentSubscriptionId,
                 ObjectType = "User"
             };

src/ResourceManager/Resources/Commands.Resources/RoleAssignments/NewAzureRoleAssignmentCommand.cs

@@ -23,7 +23,7 @@ namespace Microsoft.Azure.Commands.Resources
     /// <summary>
     /// Creates new role assignment.
     /// </summary>
-    [Cmdlet(VerbsCommon.New, "AzureRmRoleAssignment"), OutputType(typeof(PSRoleAssignment))]
+    [Cmdlet(VerbsCommon.New, "AzureRmRoleAssignment", DefaultParameterSetName = ParameterSet.Empty), OutputType(typeof(PSRoleAssignment))]
     public class NewAzureRoleAssignmentCommand : ResourcesBaseCmdlet
     {
         [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.ResourceGroupWithObjectId,
@@ -32,6 +32,8 @@ public class NewAzureRoleAssignmentCommand : ResourcesBaseCmdlet
             HelpMessage = "The user or group object id.")]
         [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.ScopeWithObjectId,
             HelpMessage = "The user or group object id.")]
+        [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.Empty,
+            HelpMessage = "The user or group object id.")]
         [ValidateNotNullOrEmpty]
         [Alias("Id", "PrincipalId")]
         public Guid ObjectId { get; set; }
@@ -98,6 +100,8 @@ public class NewAzureRoleAssignmentCommand : ResourcesBaseCmdlet
         [ValidateNotNullOrEmpty]
         public string ParentResource { get; set; }
 
+        [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.Empty,
+            HelpMessage = "Scope of the role assignment. In the format of relative URI. If not specified, will assign the role at subscription level. If specified, it can either start with \"/subscriptions/<id>\" or the part after that. If it's latter, the current subscription id will be used.")]
         [Parameter(Mandatory = false, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.ScopeWithObjectId,
             HelpMessage = "Scope of the role assignment. In the format of relative URI. If not specified, will assign the role at subscription level. If specified, it can either start with \"/subscriptions/<id>\" or the part after that. If it's latter, the current subscription id will be used.")]
         [Parameter(Mandatory = false, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.ScopeWithSignInName,