Remove docker service when draining

This is necessary because the service is not managed by BOSH as a
regular ctl script, but instead it's installed in the pre-start.

jobs/docker-windows/templates/drain.ps1

@@ -1,18 +1,19 @@
 $ErrorActionPreference = "Stop";
 
 echo "Querying docker service" | Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
-$docker=(Get-Service | where { $_.Name -eq 'docker' })
+$docker = Get-WmiObject -Class Win32_Service -Filter "Name='docker'"
 if ($docker -eq $null) {
     echo "Docker service not found; Exiting 0" | Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
     "0"
     Exit 0
 }
 
 echo "Docker service found" | Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
-If ($docker.Status -Eq "Running") {
+If ($docker.State -Eq "Running") {
     echo "Docker service running; Stopping" | Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
-    Stop-Service $docker |  Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
+    $docker.StopService() |  Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
 }
+$service.Delete()
 echo "Docker service drained; Exit 0" | Out-File -Encoding ASCII -Append "c:\var\vcap\sys\log\docker-windows\drain.log"
 
 "0"