The APIs melange is using are "incubating" in openstack-common. See:
http://wiki.openstack.org/CommonLibrary#Incubation
A config file is included for openstack-common's copy-and-paste script
to make it easy to update the code e.g.
$> git clone .../melange
$> git clone .../openstack-common
$> cd openstack-common
$> python update.py ../melange/
Note: the copies of the openstack.common modules should never be directly
modified, instead you should always make the modifications in openstack-common
and copy them across using the script.
Change-Id: I0245e30e4b4a9a2214c4f8a291b7f2caa54ab97e
e23effda88