ObsoleteFiles: Remove the miscapitalized vimage.9

MFC after: 3 days
Fixes: 08d41d8803d9 (ObsoleteFiles: Remove the miscapitalized vnet.9)
Fixes: 3049b2f5115b (vnet.9: Rename vnet.9/vimage.9 to VNET.9/VIMAGE.9)

(cherry picked from commit 8f7a4d7949d83c13a7451cba7626950d182dfc5d)