(GH-349) Ignore PowerShell InitializeDefaultDrives

If you have a network drive that is not available or has been
disconnected, PowerShell will happily throw an error about it with the
following message: "Attempting to perform the InitializeDefaultDrives
operation on the 'FileSystem' provider failed." Since it is not really
an error, we should log the message accordingly and move on, but not
fail the choco install due to some crazy warning that for some reason
is an error message.

src/chocolatey/infrastructure.app/services/PowershellService.cs

@@ -32,6 +32,7 @@ public class PowershellService : IPowershellService
         private readonly IFileSystem _fileSystem;
         private readonly string _customImports;
         private const string OPERATION_COMPLETED_SUCCESSFULLY = "The operation completed successfully.";
+        private const string INITIALIZE_DEFAULT_DRIVES = "Attempting to perform the InitializeDefaultDrives operation on the 'FileSystem' provider failed.";
 
         public PowershellService(IFileSystem fileSystem)
             : this(fileSystem, new CustomString(string.Empty))
@@ -275,7 +276,7 @@ public bool run_action(ChocolateyConfiguration configuration, PackageResult pack
                         (s, e) =>
                             {
                                 if (string.IsNullOrWhiteSpace(e.Data)) return;
-                                if (e.Data.is_equal_to(OPERATION_COMPLETED_SUCCESSFULLY))
+                                if (e.Data.is_equal_to(OPERATION_COMPLETED_SUCCESSFULLY) || e.Data.is_equal_to(INITIALIZE_DEFAULT_DRIVES))
                                 {
                                     this.Log().Info(() => " " + e.Data);
                                 }