Modify the Redfish resources' name

The name property of the Redfish resources such as Physical Systems
or Chassis other than Racks now reflect the method of composing the
name in the ManageIQ's GUI: concatenation of Manufacturer, Name
and, if available, Serial Number in parentheses.

The name of Rack instances is unchanged, i.e., it shows the Id of
the resource. To distinguish the representation from other types
of physical chassis in Redfish, we introduced the `RedfishRack`
class.

Related PR:
  * ManageIQ/manageiq-providers-redfish#61

wrapanapi/systems/redfish.py

@@ -68,7 +68,10 @@ def refresh(self):
     @property
     def name(self):
         """Return name from most recent raw data."""
-        return self.raw.Id
+        name = "{} {}".format(self.raw.Manufacturer, self.raw.Name)
+        if "SerialNumber" in self.raw:
+            name = "{} ({})".format(name, self.raw.SerialNumber)
+        return name
 
     @property
     def description(self):
@@ -132,6 +135,15 @@ def num_servers(self):
         return len(self.raw.Links.raw.get("ComputerSystems", []))
 
 
+class RedfishRack(RedfishChassis):
+    """API handler for this instance of the physical rack."""
+
+    @property
+    def name(self):
+        """Return name from most recent raw data."""
+        return self.raw.Id
+
+
 class RedfishSystem(System):
     """Client to Redfish API.
 
@@ -368,7 +380,7 @@ def get_chassis(self, resource_id, *required_types):
 
     def get_rack(self, resource_id):
         """
-        Fetch a RedfishChassis instance of the physical rack representing resource_id.
+        Fetch a RedfishRack instance of the physical rack representing resource_id.
 
         Args:
           resource_id: the Redfish @odata.id of the resource representing the
@@ -377,7 +389,12 @@ def get_rack(self, resource_id):
            InvalidValueException if the resource_id represents a Chassis that is
              not a rack
         """
-        return self.get_chassis(resource_id, "Rack")
+        rack_data = self.find(resource_id)
+        if rack_data.ChassisType != "Rack":
+            raise InvalidValueException("Chassis type {} does not match that of a Rack".format(
+                rack_data.ChassisType))
+
+        return RedfishRack(self, raw=rack_data)
 
     @property
     def num_servers(self):