Add missing dependencies
Add missing dependencies

Add httplib2 to make tests build again.

Change-Id: If581019cc7ecbe4fd7c97570c2984e215cedd43d
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

citrix-openstack-build/python-ceilometerclient,citrix-openstack-build/python-ceilometerclient