VMware: spawn refactor - phase 1 - fetch_image

One wonders why this inner method existed at all. It did nothing but
add log messages. The inner method has been stripped and the log
messages abandoned because it turns out that they added no meaningful
information at all. It is not clear what intention this method had
if any.

partial blueprint vmware-spawn-refactor

Co-authored-by: Tracy Jones <tjones@vmware.com>
Change-Id: Ib346b5739d11a7f1fc0a145673bb2701b4b59455
Merge "VMware: spawn refactor - phase 1 - fetch_image"
Merge commit 'refs/changes/27/93827/2' of git://gold.eng.hq.xensource.com/git/github/openstack/nova into tmpbranch