CI: tasks run against stemcell-builder, not CI

CI scripts should not use relative paths to address "production" code
since the `ci/` code is not subject to the pass constraints in
concourse.

Author: aramprice

ci/tasks/test-units-bosh-psmodules/run.ps1

@@ -15,9 +15,7 @@ $startupType = Get-Service "wuauserv" | Select-Object -ExpandProperty StartType
 
 $result = 0
 
-$repoRoot = "$PSScriptRoot\..\..\..\"
-
-$testModules = Get-ChildItem "$repoRoot\$env:MODULES_DIR" -recurse | where {$_.name -match ".*.Tests.ps1"} | foreach {$_.DirectoryName}
+$testModules = Get-ChildItem "stemcell-builder\$env:MODULES_DIR" -recurse | where {$_.name -match ".*.Tests.ps1"} | foreach {$_.DirectoryName}
 foreach ($module in $testModules) {
     Write-Host "Testing: $module"
     Push-Location "$module"