Updated openstack/openstack
Project: openstack/nova  79cc9c9c4f8b78b61927f4238a2ac2e53d6b9ad0

VMware: remove local variable

Make use of the instance.root_gb instead of reading the value
into a local variable.

TrivialFix

Change-Id: I2ae4a9d2f5383ff05f47d00550c1c917fedc5db9