Add blank nova/virt/baremetal/__init__.py
Add blank nova/virt/baremetal/__init__.py

Without this file in place I was seeing some test failures from the
baremetal unit tests.  The failure was:

    ImportError: No module named baremetal.db

Change-Id: I7596e7916796d5cb382d3856918b35c01814a455

dims/ironic,SauloAislan/ironic,citrix-openstack-build/ironic,debayanray/ironic_backup,varunarya10/ironic,emonty/ironic,rackerlabs/ironic,pshchelo/ironic,JioCloud/ironic,devananda/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,NaohiroTamura/ironic-lib,citrix-openstack-build/ironic-lib,bacaldwell/ironic,faizan-barmawer/openstack_ironic,Tan0/ironic,SauloAislan/ironic,faizan-barmawer/ironic-lib,froyobin/ironic,rdo-management/ironic,hpproliant/ironic,dims/ironic,openstack/ironic-lib,pshchelo/ironic,redhat-openstack/ironic,ramineni/myironic,naototty/vagrant-lxc-ironic,citrix-openstack-build/ironic,naterh/ironic,openstack/ironic,supermari0/ironic,faizan-barmawer/elytics,naototty/vagrant-lxc-ironic,bacaldwell/ironic,openstack/ironic,Tehsmash/ironic,NaohiroTamura/ironic,ionutbalutoiu/ironic