Remove depreciation / removal warning.
Remove depreciation / removal warning.

This depreciation warning is no longer relevant outside of the upstream
Nova branch.

Change-Id: Id79ba32829496ec900f31889324252e44f5f018b

Juniper/nova-docker,stackforge/nova-docker,devdattakulkarni/nova-docker-1,MinmingQian/nova-docker,derekhiggins/nova-docker,AlphaStaxLLC/nova-docker,MinmingQian/nova-docker,Juniper/nova-docker,gwdg/nova-docker,devdattakulkarni/nova-docker-1,craigtracey/nova-docker,godvmxi/nova-docker,Ye-Yong-Chi/nova-docker,mangalaman93/nova-docker,mangalaman93/nova-docker,msrba/nova-docker,harnesscloud/nova-docker,ggiamarchi/nova-docker,harnesscloud/nova-docker,cloudbase/nova-docker,Ye-Yong-Chi/nova-docker,thanhtien522/nova-docker,derekhiggins/nova-docker,thanhtien522/nova-docker,ggiamarchi/nova-docker,cloudbase/nova-docker,gwdg/nova-docker,craigtracey/nova-docker,AlphaStaxLLC/nova-docker,godvmxi/nova-docker,msrba/nova-docker,stackforge/nova-docker