Add logical pool UI support

This patch is working for add the logical disk create UI.
1 Make all storage pool type in to list box.
2 add host partition checkbox.
Signed-off-by: zhoumeina <zhoumein@linux.vnet.ibm.com>
Add build in localdisk back-end

1 Make the storage path generate at back-end
2 Add build process to logic storage pool
Signed-off-by: zhoumeina <zhoumein@linux.vnet.ibm.com>
Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>