Add Exit-Json and Fail-Json powershell helper functions

windows/setup.ps1

@@ -34,4 +34,4 @@ Set-Attr $result.ansible_facts "ansible_os_family" "Windows"
 Set-Attr $result.ansible_facts "ansible_distribution" $osversion.VersionString
 Set-Attr $result.ansible_facts "ansible_distribution_version" $osversion.Version.ToString()
 
-echo $result | ConvertTo-Json;
+Exit-Json $result;

windows/slurp.ps1

@@ -44,4 +44,4 @@ $result = New-Object psobject @{
     encoding = "base64"
 };
 Set-Attr $result "content" $content;
-echo $result | ConvertTo-Json;
+Exit-Json $result;

windows/win_ping.ps1

@@ -29,4 +29,4 @@ $result = New-Object psobject @{
     changed = $false
     ping = $data
 };
-echo $result | ConvertTo-Json;
+Exit-Json $result;

windows/win_stat.ps1

@@ -61,4 +61,4 @@ If ($get_md5 -and $result.stat.exists -and -not $result.stat.isdir)
    Set-Attr $result.stat "md5" $path_md5;
 }
 
-echo $result | ConvertTo-Json;
+Exit-Json $result;