webadmin: Order VMs/Templates in alphabetical order on export domain

Order the entities in the Export Storage Domain in an alphabetical order

Change-Id: I81ba2555cc59823a22886c7fcc6a6fffdc3c8de0
Bug-Url: https://bugzilla.redhat.com/1088294
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>