Merge upload and verification of images sections

ch_images-uploading.xml and images-verifying-install.xml have duplicated
but out of sync informations. Merge details from ch_images-uploading.xml
in images-verifying-install.xml and remove the file from the book.

Also update the Image Service commands output to match the name and ID
used in the verifying section in the rest of the doc.

Change-Id: I60537f215617b7efd61af7aa87f1fa55da6f12d2
Merge "Merge upload and verification of images sections"