Sync eng/common directory with azure-sdk-tools for PR 2290 (#3112)

* update docker-start-proxy to have a slightly different default parameter

* we were surrounding the value in single quotes, breaking recording load

Co-authored-by: scbedd <45376673+scbedd@users.noreply.github.com>

eng/common/testproxy/docker-start-proxy.ps1

@@ -1,12 +1,18 @@
  #!/usr/bin/env pwsh -c
 
 <#
+.SYNOPSIS
+Easy start/stop of docker proxy.
+
 .DESCRIPTION
 Start the docker proxy container. If it is already running, quietly exit. Any other error should fail.
+
 .PARAMETER Mode
-"start" or "stop" to start up or stop the test-proxy instance.
+Pass value "start" or "stop" to start up or stop the test-proxy instance.
+
 .PARAMETER TargetFolder
 The folder in which context the test proxy will be started. Defaults to current working directory.
+
 #>
 [CmdletBinding(SupportsShouldProcess = $true)]
 param(
@@ -14,7 +20,7 @@ param(
     [String]
     $Mode,
     [String]
-    $TargetFolder = "."
+    $TargetFolder = ""
 )
 
 try {
@@ -29,6 +35,11 @@ $SELECTED_IMAGE_TAG = "1147815"
 $CONTAINER_NAME = "ambitious_azsdk_test_proxy"
 $LINUX_IMAGE_SOURCE = "azsdkengsys.azurecr.io/engsys/testproxy-lin:${SELECTED_IMAGE_TAG}"
 $WINDOWS_IMAGE_SOURCE = "azsdkengsys.azurecr.io/engsys/testproxy-win:${SELECTED_IMAGE_TAG}"
+
+if (-not $TargetFolder){
+    $TargetFolder = Join-Path -Path $PSScriptRoot -ChildPath "../../../"
+}
+
 $root = (Resolve-Path $TargetFolder).Path.Replace("`\", "/")
 
 function Get-Proxy-Container(){

eng/common/testproxy/test-proxy-tool.yml

@@ -21,7 +21,7 @@ steps:
 
   - pwsh: |
       Start-Process $(Build.BinariesDirectory)/test-proxy/test-proxy.exe `
-        -ArgumentList "--storage-location '${{ parameters.rootFolder }}'" `
+        -ArgumentList "--storage-location ${{ parameters.rootFolder }}" `
         -NoNewWindow -PassThru -RedirectStandardOutput $(Build.SourcesDirectory)/test-proxy.log
     displayName: 'Run the testproxy - windows'
     condition: and(succeeded(), eq(variables['Agent.OS'],'Windows_NT'))