Add sort-by option for climateclient list commands

Adding a sort-by parameter for the climateclient list command so that
when a list is retrieved, it will be order by the column that the user
prefered.
Default value will be 'name' for leases and 'hypervisor_hostname' for
hosts (which are more meaningful order attributes than id).

Change-Id: Ie6a4df384770123ec5fc4cf43823ce5ef1a47ca5
Closes-Bug: #1304595
Merge "Add sort-by option for climateclient list commands"