Add support for http boot

Some redfish require us to be very specific.

confluent_client/bin/nodesetboot

@@ -32,7 +32,7 @@ if path.startswith('/opt'):
 import confluent.client as client
 
 argparser = optparse.OptionParser(
-    usage='Usage: %prog [options] <noderange> [default|cd|network|setup|hd|usb|floppy]')
+    usage='Usage: %prog [options] <noderange> [default|cd|network|http|setup|hd|usb|floppy]')
 argparser.add_option('-b', '--bios', dest='biosmode',
                      action='store_true', default=False,
                      help='Request BIOS style boot (rather than UEFI)')

confluent_server/confluent/messages.py

@@ -1288,6 +1288,7 @@ class BootDevice(ConfluentChoiceMessage):
         'cd',
         'floppy',
         'usb',
+        'http',
     ])
 
     valid_bootmodes = set([