Move eventlent monkeypatch out of cmd/

Completing a #TODO that I left for myself months ago,
now that we are using PBR for our build system,
move the eventlent monkey patching out of ironic/cmd/__init__
and into ironic/__init__

Change-Id: I1fd352919de0a2afe7058ab84c208781ce095dab
Merge "Move eventlent monkeypatch out of cmd/"