Allow different auth providers via plugin system.

- Remove the NOVA_RAX_AUTH hack and provide (temporary) compatibility
  with the new system.
- Example plugin for RAX and HP provided here :
    RAX - https://github.com/emonty/rackspace-auth-openstack
    HP - https://github.com/emonty/hpcloud-auth-openstack
- Plugin are allowed to specify their own auth_url directly.
- Thanks to mtaylor for helping on this.

Change-Id: Ie96835be617c6a20d9c3fc3bd1536083aecfdc0b

1 files changed, 9 insertions, 0 deletions

diff --git a/novaclient/exceptions.py b/novaclient/exceptions.py
index 91bf30ef..da626921 100644
--- a/novaclient/exceptions.py
+++ b/novaclient/exceptions.py
@@ -22,6 +22,15 @@ class NoUniqueMatch(Exception):
     pass
 
 
+class AuthSystemNotFound(Exception):
+    """When the user specify a AuthSystem but not installed."""
+    def __init__(self, auth_system):
+        self.auth_system = auth_system
+
+    def __str__(self):
+        return "AuthSystemNotFound: %s" % repr(self.auth_system)
+
+
 class NoTokenLookupException(Exception):
     """This form of authentication does not support looking up
        endpoints from an existing token."""