Remove redundant line from host_manager.py
Remove redundant line from host_manager.py

With change[1], we introduced a redundant line in
cinder/scheduler/host_manager.py
This patch removes it.

[1] I07d74078dbb102490dd722029e32c74cec3aa44c

Change-Id: Ic4918c04493360a5913c8f4854bb44b6048af264

mahak/cinder,openstack/cinder,mahak/cinder,openstack/cinder