Change kvm-img to qemu-img in the two places it remains.

qemu-img is the current canonical name of the tool.  kvm-img is a
compatibility symlink to it in Ubuntu, but is not present in Fedora
or RHOS.  The rest of the manuals use qemu-img; these are the last
two references to kvm-img.

Change-Id: I47036218ba5d3eff7d2e2c70a2d25542110edfb7
Fix some broken links to the new image guide.

Fix bug 1185919

Change-Id: If03290e1cb02e63b065365e724fc78ce1763472d
Fix broken links to the new VM image guide.

Fix bug 1185919

Change-Id: I0cde59121cba1cb1b26cabcc7c7a48162b4f22f2
Merge "Change kvm-img to qemu-img in the two places it remains."