Update dependencies from https://github.com/dotnet/arcade build 20190607.62

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19307.62

eng/common/darc-init.ps1

@@ -11,10 +11,10 @@ function InstallDarcCli ($darcVersion) {
 
   $dotnetRoot = InitializeDotNetCli -install:$true
   $dotnet = "$dotnetRoot\dotnet.exe"
-  $toolList = Invoke-Expression "& `"$dotnet`" tool list -g"
+  $toolList = & "$dotnet" tool list -g
 
   if ($toolList -like "*$darcCliPackageName*") {
-    Invoke-Expression "& `"$dotnet`" tool uninstall $darcCliPackageName -g"
+    & "$dotnet" tool uninstall $darcCliPackageName -g
   }
 
   # If the user didn't explicitly specify the darc version,
@@ -22,12 +22,12 @@ function InstallDarcCli ($darcVersion) {
   if (-not $darcVersion) {
     $darcVersion = $(Invoke-WebRequest -Uri $versionEndpoint -UseBasicParsing).Content
   }
-  
+
   $arcadeServicesSource = 'https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json'
 
   Write-Host "Installing Darc CLI version $darcVersion..."
   Write-Host "You may need to restart your command window if this is the first dotnet tool you have installed."
-  Invoke-Expression "& `"$dotnet`" tool install $darcCliPackageName --version $darcVersion --add-source '$arcadeServicesSource' -v $verbosity -g"
+  & "$dotnet" tool install $darcCliPackageName --version $darcVersion --add-source "$arcadeServicesSource" -v $verbosity -g
 }
 
 InstallDarcCli $darcVersion