Output '.NET' pane should stream results of dotnet-restore

[natemcmaster]

Environment data

dotnet --info output:

.NET Command Line Tools (1.0.0-preview2-003024)

Product Information:
 Version:            1.0.0-preview2-003024
 Commit SHA-1 hash:  ef4a8e85ef

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.10586
 OS Platform: Windows
 RID:         win10-x64

VS Code version: 1.1.6
C# Extension version: 1.2

Steps to reproduce

Trigger a "dotnet restore". (Same behavior if triggered from command palette or the "restore" button on the error message).

Expected behavior

Open Output pane and pipe output from dotnet restore to the UI.

Actual behavior

Output does not appear until the restore operation is complete.