refactor(wakeup): rewrite connectivity check timer loop

- use do loop to run at least one check
- check total time vs timeout in trailing while condition

wakeup.ps1

@@ -161,11 +161,11 @@ for ($i = $ConnectivityCheckDelay; $i -gt 0; $i--) {
 Write-Progress -Activity "Waiting for computer(s) to wake-up..." -Completed
 
 # iterate computers and test connectivity
-# TODO: run multiple connectivity tests as needed, spaced evenly apart up to max timeout THEN fail
+# TODO: report error/fail only after final run
 # TODO: run connectivity test as background job
 $connCheckTotalTime = 0
 $removeFromTargetComputers.Clear()
-while ($connCheckTotalTime -le $ConnectivityCheckTimeout -and $targetComputers.Count -gt 0)
+do
 {
     $targetComputers | ForEach-Object {
         $name = $_.name
@@ -213,7 +213,7 @@ while ($connCheckTotalTime -le $ConnectivityCheckTimeout -and $targetComputers.C
         Write-Progress -Activity "Waiting for next connectivity check..." -Completed
         $connCheckTotalTime += $ConnectivityCheckInterval
     }
-}
+} while ($connCheckTotalTime -le $ConnectivityCheckTimeout -and $targetComputers.Count -gt 0)
 
 # exit gracefully
 exitGracefully