Skip unnecessary SDK get_machine calls

The _process_sdk function starts by calling cloud.list_machines() which
returns all nodes including their names. There is no need to call
cloud.get_machine individually for each node just to get its name
attribute when we might be skipping this node.

This speeds up execution of the Bifrost inventory module when
BIFROST_NODE_NAMES is used.

Change-Id: I27ccc12b9f408d510710d5ba82ad04135169827a
(cherry picked from commit 3017112)

bifrost/inventory.py

@@ -232,7 +232,6 @@ def _process_sdk(groups, hostvars):
         node_names = node_names.split(',')
 
     for machine in machines:
-        machine = cloud.get_machine(machine['uuid'])
         if machine['name'] is None:
             name = machine['uuid']
         else:
@@ -241,6 +240,7 @@ def _process_sdk(groups, hostvars):
         if node_names and name not in node_names:
             continue
 
+        machine = cloud.get_machine(machine['uuid'])
         new_machine = {}
         for key, value in machine.items():
             # NOTE(TheJulia): We don't want to pass infomrational links