ggiamarchi/vagrant-openstack-provider — pull request #189 by mangelajo (2014-12-23 11:56:11+00:00)
Title: Allow lists in config values

This may allow, for example using a list of flavors which could
not be compatible across clouds, but allowing to fall back.

For example:
os.flavor = ['mylab.4cpu.8gb.20hd', 'm1.large']

Will try the first one, and then the next one, if not found.