Be more tolerant of 'ssh_authorized_keys' types

Instead of only expected a list, tuple, or set type
allow for a string type and dict to be passed in for 'ssh_authorized_keys',
and add log message that occurs if some other type is used that
can not be correctly processed.

ChangeLog

@@ -11,6 +11,9 @@
  - Increase the usefulness, robustness, configurability of the chef module
    so that it is more useful, more documented and better for users
  - Fix how '=' signs are not handled that well in ssh_utils (LP: #1391303)
+ - Be more tolerant of ssh keys passed into 'ssh_authorized_keys'; allowing
+   for list, tuple, set, dict, string types and warning on other unexpected
+   types
 0.7.6:
  - open 0.7.6
  - Enable vendordata on CloudSigma datasource (LP: #1303986)

cloudinit/distros/__init__.py

@@ -387,7 +387,19 @@ class Distro(object):
 
         # Import SSH keys
         if 'ssh_authorized_keys' in kwargs:
-            keys = set(kwargs['ssh_authorized_keys']) or []
+            # Try to handle this in a smart manner.
+            keys = kwargs['ssh_authorized_keys']
+            if isinstance(keys, (basestring, str)):
+                keys = [keys]
+            if isinstance(keys, dict):
+                keys = list(keys.values())
+            if keys is not None:
+                if not isinstance(keys, (tuple, list, set)):
+                    LOG.warn("Invalid type '%s' detected for"
+                             " 'ssh_authorized_keys', expected list,"
+                             " string, dict, or set.", type(keys))
+                else:
+                    keys = set(keys) or []
                     ssh_util.setup_user_keys(keys, name, options=None)
 
         return True