Added a simplified script for connecting an Azure Agent through JNLP (doesn't require user credentials)

powershell/Jenkins-Windows-Init-Script-no-secrets.ps1

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+Set-ExecutionPolicy Unrestricted
+# Jenkins plugin will dynamically pass the server name and vm name.
+# If your jenkins server is configured for security , make sure to edit command for how slave executes
+$jenkinsserverurl = $args[0]
+$vmname = $args[1]
+$secret = $args[2]
+
+
+# Download the file to a specific location
+Write-Output "Downloading zulu SDK "
+$source = "http://azure.azulsystems.com/zulu/zulu1.7.0_51-7.3.0.4-win64.zip?jenkins"
+mkdir d:\azurecsdir
+$destination = "d:\azurecsdir\zuluJDK.zip"
+$wc = New-Object System.Net.WebClient
+$wc.DownloadFile($source, $destination)
+
+Write-Output "Unzipping JDK "
+# Unzip the file to specified location
+$shell_app=new-object -com shell.application
+$zip_file = $shell_app.namespace($destination)
+mkdir d:\java
+$destination = $shell_app.namespace("d:\java")
+$destination.Copyhere($zip_file.items())
+Write-Output "Successfully downloaded and extracted JDK "
+
+# Downloading jenkins slaves jar
+Write-Output "Downloading jenkins slave jar "
+$slaveSource = $jenkinsserverurl + "jnlpJars/slave.jar"
+$destSource = "d:\java\slave.jar"
+$wc = New-Object System.Net.WebClient
+$wc.DownloadFile($slaveSource, $destSource)
+
+# execute slave
+Write-Output "Executing slave process "
+$java="d:\java\zulu1.7.0_51-7.3.0.4-win64\bin\java.exe"
+$jar="-jar"
+$jnlpUrl="-jnlpUrl"
+$secretFlag="-secret"
+$serverURL=$jenkinsserverurl+"computer/" + $vmname + "/slave-agent.jnlp"
+& $java $jar $destSource $secretFlag $secret $jnlpUrl $serverURL