This support only works with the RestController post()
method if the method just uses a 'body' argument.

Change-Id: I4e9a3b93e0babfbec869ac1db056c8652ebebedc
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

The original version of this extension was part of the
ceilometer code base at https://github.com/openstack/ceilometer

.
It is being moved to its own package to make it easier to
reuse with other OpenStack components.

Change-Id: I9cfc2ee84c8b0a918dbcb59a8a5b8a3cb2bce044
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>