Added Power Actions sample actions

Signed-off-by: Kamen Nikolov <knikolov@vmware.com>

PowerActions/Example - RemoveOldClusterSnapshots.ps1

@@ -0,0 +1,17 @@
+param (
+    [Parameter(Mandatory=$true)]    
+    [VMware.VimAutomation.ViCore.Types.V1.Inventory.Cluster] $cluster, 
+    [DateTime] $date)
+
+if ($null -eq $date) {
+    $date = (Get-Date).AddDays(-7)
+}
+
+$vms = Get-VM -Location $cluster
+foreach ($vm in $vms) {
+    $snaphostsToBeRemoved = Get-Snapshot -VM $vm | where {$_.Created -lt $date}
+    if ($null -ne $snaphostsToBeRemoved) {
+        Write-Host "Removing snapshots: " + $snaphostsToBeRemoved + " of VM: " + $vm
+        Remove-Snapshot $snaphostsToBeRemoved -Confirm:$false
+    }
+}