Description of problem:
While verifying bug 893374 I've noticed that none of the ephemeral and swap disks work any more.
 
Booting an instance with an swap and/or ephemeral disk(s) will fail moving the instance to ERROR. This is the default if the flavor specifies an swap or ephemeral disk.

This bug was introduced in https://review.openstack.org/54767 which introduces a new argument in the fetch_image/fetch_to_raw methods to enforce the maximum size an image can have. Erroneously, this argument is also passed to the _create_ephemeral and _create_swap methods which don't recognize it and crash dramatically while trying to create the images.

Version-Release number of selected component (if applicable):
openstack-nova-2013.2-9.el6ost.noarch

How reproducible:
Always.

Steps to Reproduce:
1. nova flavor-create m1.custom auto 64 0 1 --ephemeral 1 --swap 1024
2. nova boot --image cirros --flavor m1.custom nuvol
3. instance goes to ERROR state when spawning
4. In compute.log we can encounter the tracebacks specified below. 

Actual results:
Instances don't boot and are moved to the ERROR state.

Expected results:
Instance boots with the swap and/or ephemeral disks.

Additional info:

 Traceback (most recent call last):
   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1037, in _build_instance
     set_access_ip=set_access_ip)
   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1420, in _spawn
     LOG.exception(_('Instance failed to spawn'), instance=instance)
   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1417, in _spawn
     block_device_info)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2063, in spawn
     admin_pass=admin_password)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2370, in _create_image
     ephemeral_size=ephemeral_gb)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 174, in cache
     *args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 307, in
     prepare_template(target=base, max_size=size, *args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 246, in inner
     return f(*args, **kwargs)
   File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__                                                                                                                                
     self.gen.throw(type, value, traceback)
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 205, in lock
     yield lock
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 246, 
     return f(*args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 162, in call_if_not_exists
     fetch_func(target=target, *args, **kwargs)
 TypeError: _create_ephemeral() got an unexpected keyword argument 'max_size'

 Traceback (most recent call last):                                                                                                                                                               
   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1417, in _spawn
     block_device_info)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2063, in spawn
     admin_pass=admin_password)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2402, in _create_image
     swap_mb=swap_mb)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 174, in cache
     *args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 307, in create_image
     prepare_template(target=base, max_size=size, *args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 246, in inner
     return f(*args, **kwargs)
   File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__
     self.gen.throw(type, value, traceback)
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 205, in lock 
     yield lock
   File "/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line 246, in inner
     return f(*args, **kwargs)
   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py", line 162, in call_if_not_exists
     fetch_func(target=target, *args, **kwargs)
 TypeError: _create_swap() got an unexpected keyword argument 'max_size'