redfish: change default virtual media storage to local storage

This may be the most overridden default of Ironic, which means
we need to change the default value.

The default for ``[redfish]use_swift`` was historically ``true``,
however we've generally found that BMCs are particularlly sensitive
to extra characters in the URL as the characters may signify a
dynamically generated file, which would be problematic as virtual
media webservers also generally require range retrieval support.

This change makes the default ``false`` which should lead to one
less override for operators being necessary in practical operation.

Change-Id: Iad57b3c6423bced0e3cb6fb4e31aad6d805f26fa

ironic/conf/redfish.py

@@ -45,7 +45,7 @@ opts = [
                default='auto',
                help=_('Redfish HTTP client authentication method.')),
     cfg.BoolOpt('use_swift',
-                default=True,
+                default=False,
                 mutable=True,
                 help=_('Upload generated ISO images for virtual media boot to '
                        'Swift, then pass temporary URL to BMC for booting the '

releasenotes/notes/redfish-virtual-media-default-not-swift-3917f0e14fd62a0d.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The default value for ``[redfish]use_swift`` has been changed to
+    ``false``. This is to limit URL validation challenges presented by some
+    baseboard management controllers where characters in the Swift temporary
+    URL form are rejected by Baseboard Management Controllers.