Extends Chain CLI to be able to specify an IP address group.

Also fixed a bug in handling an inversion of object reference.

Fix MN-1078

Change-Id: Ic862fda231dd6b63843bfb61971800f138ac16e6
Merge pull request #101 from midokura/dev/tomohiko/chain_ipagroup_master/20140124

Extends Chain CLI to be able to specify an IP address group.