build: fix git error in appveyor (#5631)

Add --quiet to git checkout which should resolve error message displayed in AppVeyor

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## Unreleased
 
 - Update the contribution guideline to note that updating the changelog is required. (#5586)
+- Remove Pester as a module include with the PowerShell Packages.
+  In the future, you should be able to add it by running `Install-Module Pester`. (#5623, #5631)
 
 ## v6.0.0-rc - 2017-11-16
 

build.psm1

@@ -2363,7 +2363,7 @@ function Restore-GitModule
 
     Push-location $clonePath
     try {
-        $null = Start-NativeExecution {git checkout -b desiredCommit $CommitSha} -SuppressOutput
+        $null = Start-NativeExecution {git checkout --quiet -b desiredCommit $CommitSha} -SuppressOutput
 
         $gitItems = Join-Path -Path $clonePath -ChildPath '.git*'
         $ymlItems = Join-Path -Path $clonePath -ChildPath '*.yml'