Up common depends to 0.3 series

cookbook-openstack-compute is dependent on the
0.3 openstack-common series already, so if you
try to put, say, a Berksfile together that pulls
in both compute and block-storage, you get an
incompatible dependency. When one cookbook upgrades
its dependency on a new version of the common lib,
all the other cookbooks need to change.

Change-Id: I45df927f0592d267c4da3343e9ccdf42f0410ca7