Update storage pool list after activate/deactivate

After activating or deactivating a storage pool, the page may update the
pool list even if the operation has not been finished. That results in
inconsistent information in the UI, like duplicate or missing entries.

Make sure the storage pool list is updated only after the
activate/deactivate operation finishes successfully.

Signed-off-by: Crístian Viana <vianac@linux.vnet.ibm.com>
Sort the storage pool list

The storage pool list is displayed in the order returned by libvirt.

Sort the output alphabetically.

Signed-off-by: Crístian Viana <vianac@linux.vnet.ibm.com>