prefix powershell commands with $ProgressPreference = "SilentlyContinue"

[chris-rock]

Recently we've seen errors in appveyor that highlight a general issue with data streams in powershell. Since train does not need the progress information (which is useful for a terminal), I propose we set $ProgressPreference = "SilentlyContinue" as a prefix for all commands under windows.

Our winrm implementation does not seem to be affected by that.

cc @arlimus @ksubrama @mwrock

A sample output from appveyor:

  1) Failure:
windows local command#test_0003_use powershell piping [test/windows/local_test.rb:39]:
--- expected
+++ actual
@@ -1,2 +1,3 @@
 # encoding: UTF-8
-""
+"#< CLIXML\r
+<Objs Version=\"1.1.0.1\" xmlns=\"http://schemas.microsoft.com/powershell/2004/04\"><Obj S=\"progress\" RefId=\"0\"><TN RefId=\"0\"><T>System.Management.Automation.PSCustomObject</T><T>System.Object</T></TN><MS><I64 N=\"SourceId\">1</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj><Obj S=\"progress\" RefId=\"1\"><TNRef RefId=\"0\" /><MS><I64 N=\"SourceId\">2</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj></Objs>"
  2) Failure:
windows local command#test_0002_run echo test [test/windows/local_test.rb:33]:
--- expected
+++ actual
@@ -1,2 +1,3 @@
 # encoding: UTF-8
-""
+"#< CLIXML\r
+<Objs Version=\"1.1.0.1\" xmlns=\"http://schemas.microsoft.com/powershell/2004/04\"><Obj S=\"progress\" RefId=\"0\"><TN RefId=\"0\"><T>System.Management.Automation.PSCustomObject</T><T>System.Object</T></TN><MS><I64 N=\"SourceId\">1</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj><Obj S=\"progress\" RefId=\"1\"><TNRef RefId=\"0\" /><MS><I64 N=\"SourceId\">2</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj></Objs>"

[chris-rock]

nevermind, we do it already https://github.com/chef/train/blob/master/lib/train/extras/command_wrapper.rb#L112-L124