Tree building sorts children by name so we must name our storages.

See build_smartproxy_affinity_node:
https://github.com/ManageIQ/manageiq/blob/e405e1ad52072a0c7f341481d6457841e849450e/vmdb/app/controllers/ops_controller/settings/common.rb#L1272

This fixes a sporadic test failure where the storages are in unexpected order because they have no name.
So, for fun, I made the test run 100 times, it failed twice: storage_9/storage_10 and storage_99 and storage_100... :see_no_evil: So, it's not random at all.

```
  1) OpsController OpsController::Settings::Common SmartProxy Affinity #build_smartproxy_affinity_tree should build a SmartProxy Affinity tree
     Failure/Error: tree.should be == [
       expected: == [{:key=>"2147", :icon=>"evm_server.png", :title=>"Server: svr1 [2147]", :expand=>true, :children=>[{:key=>"2147__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2147__host_2167", :icon=>"host.png", :title=>"host1", :select=>true}, {:key=>"2147__host_2168", :icon=>"host.png", :title=>"host2", :select=>false}]}, {:key=>"2147__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2147__storage_2167", :icon=>"storage.png", :title=>"storage_9", :select=>true}, {:key=>"2147__storage_2168", :icon=>"storage.png", :title=>"storage_10", :select=>false}]}]}, {:key=>"2148", :icon=>"evm_server.png", :title=>"Server: svr2 [2148]", :expand=>true, :children=>[{:key=>"2148__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2148__host_2167", :icon=>"host.png", :title=>"host1", :select=>false}, {:key=>"2148__host_2168", :icon=>"host.png", :title=>"host2", :select=>true}]}, {:key=>"2148__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2148__storage_2167", :icon=>"storage.png", :title=>"storage_9", :select=>false}, {:key=>"2148__storage_2168", :icon=>"storage.png", :title=>"storage_10", :select=>true}]}]}]
            got:    [{:key=>"2147", :icon=>"evm_server.png", :title=>"Server: svr1 [2147]", :expand=>true, :children=>[{:key=>"2147__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2147__host_2167", :icon=>"host.png", :title=>"host1", :select=>true}, {:key=>"2147__host_2168", :icon=>"host.png", :title=>"host2", :select=>false}]}, {:key=>"2147__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2147__storage_2168", :icon=>"storage.png", :title=>"storage_10", :select=>false}, {:key=>"2147__storage_2167", :icon=>"storage.png", :title=>"storage_9", :select=>true}]}]}, {:key=>"2148", :icon=>"evm_server.png", :title=>"Server: svr2 [2148]", :expand=>true, :children=>[{:key=>"2148__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2148__host_2167", :icon=>"host.png", :title=>"host1", :select=>false}, {:key=>"2148__host_2168", :icon=>"host.png", :title=>"host2", :select=>true}]}, {:key=>"2148__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2148__storage_2168", :icon=>"storage.png", :title=>"storage_10", :select=>true}, {:key=>"2148__storage_2167", :icon=>"storage.png", :title=>"storage_9", :select=>false}]}]}]
```

```
  2) OpsController OpsController::Settings::Common SmartProxy Affinity #build_smartproxy_affinity_tree should build a SmartProxy Affinity tree
     Failure/Error: tree.should be == [
       expected: == [{:key=>"2237", :icon=>"evm_server.png", :title=>"Server: svr1 [2237]", :expand=>true, :children=>[{:key=>"2237__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2237__host_2257", :icon=>"host.png", :title=>"host1", :select=>true}, {:key=>"2237__host_2258", :icon=>"host.png", :title=>"host2", :select=>false}]}, {:key=>"2237__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2237__storage_2257", :icon=>"storage.png", :title=>"storage_99", :select=>true}, {:key=>"2237__storage_2258", :icon=>"storage.png", :title=>"storage_100", :select=>false}]}]}, {:key=>"2238", :icon=>"evm_server.png", :title=>"Server: svr2 [2238]", :expand=>true, :children=>[{:key=>"2238__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2238__host_2257", :icon=>"host.png", :title=>"host1", :select=>false}, {:key=>"2238__host_2258", :icon=>"host.png", :title=>"host2", :select=>true}]}, {:key=>"2238__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2238__storage_2257", :icon=>"storage.png", :title=>"storage_99", :select=>false}, {:key=>"2238__storage_2258", :icon=>"storage.png", :title=>"storage_100", :select=>true}]}]}]
            got:    [{:key=>"2237", :icon=>"evm_server.png", :title=>"Server: svr1 [2237]", :expand=>true, :children=>[{:key=>"2237__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2237__host_2257", :icon=>"host.png", :title=>"host1", :select=>true}, {:key=>"2237__host_2258", :icon=>"host.png", :title=>"host2", :select=>false}]}, {:key=>"2237__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2237__storage_2258", :icon=>"storage.png", :title=>"storage_100", :select=>false}, {:key=>"2237__storage_2257", :icon=>"storage.png", :title=>"storage_99", :select=>true}]}]}, {:key=>"2238", :icon=>"evm_server.png", :title=>"Server: svr2 [2238]", :expand=>true, :children=>[{:key=>"2238__host", :icon=>"host.png", :title=>"Hosts", :children=>[{:key=>"2238__host_2257", :icon=>"host.png", :title=>"host1", :select=>false}, {:key=>"2238__host_2258", :icon=>"host.png", :title=>"host2", :select=>true}]}, {:key=>"2238__storage", :icon=>"storage.png", :title=>"Datastores", :children=>[{:key=>"2238__storage_2258", :icon=>"storage.png", :title=>"storage_100", :select=>true}, {:key=>"2238__storage_2257", :icon=>"storage.png", :title=>"storage_99", :select=>false}]}]}]
```