Add current commit into logs for custom builds (#1419)

* Show latest commit for custom repos

* Remove unused variables from templates

* Add Get-LatestCommit function

* Fix in synopsis

* Remove SSH_Password variables from Windows Images

* Rename download-customrepo

* Fix in synopsis

images.CI/download-repo.ps1

@@ -0,0 +1,14 @@
+param(
+    [String] [Parameter (Mandatory=$true)] $RepoUrl,
+    [String] [Parameter (Mandatory=$true)] $RepoBranch
+)
+
+Write-Host "Clean up default repository"
+Remove-Item -path './*' -Recurse -Force
+
+Write-Host "Download ${RepoBranch} branch from ${RepoUrl}"
+$env:GIT_REDIRECT_STDERR = '2>&1'
+git clone $RepoUrl . -b $RepoBranch --single-branch --depth 1
+
+Write-Host "Latest commit:"
+git log --pretty=format:"Date: %cd; Commit: %H - %s; Author: %an <%ae>" -1